Quoting MX23:" ok im a guy my gf is preganant. we are 17. i have no idea about babys at all and she cant either. i ... [snip!] ... to feed it? and like how to change a diaper and when to make it go to bed. like how much sleep do they need. stuff like that. "
You can rent videos and practice on baby dolls. But you can just do like most people and take classes. Find where they do classes in your local area. If you are not sure where to start, go to the local WIC /Health Department and ask. They will get you going in the right direction. However most of your lessons will come from your baby when baby gets here.
Props to you for being such a good and proactive daddy.
You are going to make a wonderful father.