I've always been a finger bassist too and it's probably going to be a bit of a transition from playing as if you're palm muting to the more open finger styley. My advice is probably pretty shit but, just start slow, play along to bands that have a reasonable pace. A good point to start is any of the Jason Newstead Metallica stuff. The hard rock riffs will be perfect to break in your fingers into something at a medium pace, whilst still retaining some complexity. It'll take a couple of weeks for your calluses to come in on your index and middle fingers, which might be really annoying and hinder playing. Just play through them and battle on, they'll soon pass, and you'll be ready for much faster epic stuff