so i had that vampire chick turn me into a vampire at the end of the dawngaurd quest. I have never been a vampire before. what do i need to know/do like important info? how do i feed on people and stuf like that

Usually you would feed by sneaking up on sleeping people and talk to them, which will bring up the option for feeding. In Dawnguard, your Vampire Lord's red spell also counts, and I believe there are also a few ways to feed past that. Try Vampire's Seduction to feed on someone who isn't asleep.

Works perfectly

OT:you don't regen while in sunlight(that includes shadows) and you have 4 days to feed or everyone will be hostile to you.(except other vampires).