You should have a couple of vents on the enclosure, also thermostats will tell you what it is in the enclosure, keep that to a reasonable level and you'll be fine. Give your snake plenty of places to hide and cool water as has been mentioned....find out what temps your snake needs and adjust the enclosure to suit its needs. I know it all sounds terribly complicated.....when I started I got so stressed and confused I nearly gave up...but 4 months down the track and it's all fitted into place....you'll be fine....just ask as many questions as you like, no one will get sick of your questions, we just want to help. I'm not very experienced, but some on this site are and will help you a lot.
cheers, Annie