Stansted airport to Victoria station

National Express and Terravision buses both run to Victoria bus station ,about 1/4 from the rail station.
Journey time 90mins, fare £9/10, more info on stansted airport site.
At first look the train into London is £23 pay on the day,then change to tube to get to victoria.

Sounds like you're covered. Enjoy your trip!

Both bus companies and rail can be a lot cheaper booked in advance, but note that the rail fare in this case is only through to Liverpool Street, and changing earlier to the Victoria Line at Tottenham Hale is not permitted with it.