Try starting with a romance book--those are easy to read, easy to follow, and trust me when I say that they keep your intrest!
After you put the baby down for the night, pull out the book and curl on the couch with something to drink. Just read--if you don't read beyond the first 10 pages before you give up, you won't read it at all. If you read in bed, you WILL fall asleep.
By starting small, you're getting the juices (creative, of course!) running! Next, try a little Jane Austen. Romance and "Emma" go hand in hand! If that is too intense for you, ask your local book store for assistance. Explain to them that you don't have a lot of time to read, and you would like some good reads.
Also try the self-help book. Have you read these books?
Happiest Baby on the Block?
Happiest Toddler on the Block?
The Five Love Languages (Chapman)?
Total Money Makeover (Ramsey)?
Do you like comedy?
Basically, find something you enjoy. Do you like deep, emotional books? Sci-Fi?
Here's where I would go...
1) Romance
2) Self-Help
3) Non Fiction
4) Fiction--Novella
5) Fiction--Novel
6) Sci-Fi (if you're up for it)