I'm a beginner corn snake owner any advice?

OK, i got my corn snake about.... Hmmm like a month ago. Don't worry. Frozen PINKIES (baby mice) cost about 2 Canadian $$$$. Anyway, a 20 gallon ttank should do it, but i prefer a 40 gallon tank (for adult) or maybe 30. If you are limited on room, go with a 20 gallon tank for LIFE. Is there Petco in Canada??? if there is, you can buy mice, and/or the snake. It shouldn't cost much. GOOD LUCK!