6 days in April- first time! W 18 YO

Do your 6 days include travel days?
Do you have any previous experience with driving in left-hand traffic?
Where will you be flying in from? Arrival time?

I would consider saving Dublin for a future trip given your stated interests and time constraints. If you can just as easily fly into Shannon, that would be more convenient in my view, and I would pick two base, w/ maybe just a one night stay near the airport at the end if needed. (My stay in Galway was interrupted so I cannot advise on specifics, but this is the overarching plan I'd go with--good luck!)

6 days do not include travel (1 day on each end for travel to and from USA). Husband has had some experience driving left handed but on a track. Plan right now is to fly into Dub, arrive around either 4:50am or 9:00am depending on best deal.

So, Dublin it is--in that case, I'd taxi to city, shake off jet lag, and the next day, pick up car (we chose to return to airport for this) and head west. Your departure time and where you need to stay the night before departure will determine how many days you have to play with, so you might just want to choose one base in the west.

Spend the first day and night in and around Dublin which gives time to recover from jet lag. Then head west and plan to fly out of Shannon.

Connemara, Burren or Dingle areas are worth considering as they will give a good mix of scenery and culture. In the time allowed just choose a maximium of two bases. (You can 'do' the Burren on the way between Connemara and Dingle. )

Have a look at this website for ideas of Farmhouse B&B

Another option would be to continue on to the Kerry airport near Killarney after your morning arrival in Dublin. Ryan Air runs two flights per day between the two airports - and I see that there's one departing DUB at around 9AM. If that meshes with your other plans it might be a convenient way to "steal a day" rather than driving across the country (twice).
There are a number of rental car outlets at Kerry, so you could collect your vehicle there or spend the night somewhere close by (Killarney maybe) to shake off your jet lag before getting behind the wheel.
For our own trips to SW Ireland we usually opt to stay in a self-catering place (VRBO, Air BnB, etc.) somewhere along the corridor between the villages of Killorglin and Castlemaine. That way we only have to unpack once and can settle in for a few days while we explore both the Dingle peninsula to the north and the Ring of Kerry and Killarney NP to the south.
In April you'll be ahead of the tourist crowds that start to peak after Memorial Day, and the gardens and countryside will be in the full bloom of Spring - it's a great time to visit.
You could then drop your rental car back at the Kerry airport and return to Dublin ... again on one of the Ryan Air flights.
With so little discretionary time at your disposal I too would suggest concentrating on a single area rather than overextending yourselves by trying to pack in too much on a first trip.

Good deal from JFK to Shannon is also an alternative ! Would that be advisable considering our interests? I’m not that very keen on Dublin and can skip it this trip.

Flying into Shannon would certainly simplify your logistics if your primary interest is the West of Ireland.

Good deal from JFK to Shannon is also an alternative ! Would that be
advisable considering our interests? I’m not that very keen on Dublin
and can skip it this trip.

That is certainly what I would do.

Thx all! So we’ve modified flight plans to fly into Shannon. Any suggestions on towns/areas to stay in? I found the B&B site helpful and am thinking we’d like to split our stay up between two areas to get the most out of the trip! I’d love to stay in a farm house and then somewhere closer to the sea/quaint town. Thx again!

Adare is a very pretty & quaint little market town about 45 minutes by car from Shannon on the way towards Dingle. It's popular due to the number of thatched cottages and other buildings in the town, which makes it a popular stop for day trippers. Can google it to see if it might be of interest.
Staying in Dingle town itself might be a good option for you in April ... ie before the big tourist crush of summer. Would satisfy your desire for a seaside setting, and the guest houses and B&B's will just be opening up for the season. My suggestion would be to book a place withing walking (or stumbling) distace from the town center so you can enjoy some of the cute little pubs without the worry of running afoul of the strict Irish drink-driving laws.
Might add that there's a lot more to see in and around Dingle besides Slea Head Drive although that's the headliner.

We stayed on an actual farm (B&B) near Ennis. It was close enough to Shannon that we stayed there the night before and early AM flight.
The Burren is fun to drive through.
Dingle was the place we liked best. Many pubs and restaurants. The drive on Slea Head was scenic. Blasket Islands for a different experience (day trip). Alas, Fungie the Dolphin is no more.

Another recent post mentioned this place:
https://www.lawcusfarmguesthouse.com
I haven't been so can't vouch for it, but it seems to fit the bill, if a bit far from the areas you've talked about wanting to see.
I would get on AirBnB and do a very broad search in Dingle, Kerry and Beara Peninsulas for a beachfront house. The great thing about having a car is that you don't have to stay in a town with a train or bus connection.