does anyone know what bus to catch to get to Fougères from rennes?

The Ouibus has multiple departures a day

do you know what number?

There is one every hour, It depends on what day what hour

what road?

do i buy my bus ticket while on the bus or at a station?

There is more than one service

You can catch it at Gare de Rennes (the same place as the Rennes Train Station) and you can buy in advance online
https://www.ter.sncf.com/bretagne/gares/87471003/Rennes/pratique

or you can catch the 9a bus in front of the Mairie in Rennes
http://www.illenoo-services.fr/en

any options for booking for those of us who cannot speak french? i can't see any ''purchase'' button on the link.

https://www.trainline.eu/search/rennes/fougeres/2019-01-29-08:00

thanks so much

one last question: what road is the marie on? does the 9a show on google maps?