If you're REALLY nervous, make a premium account with a different name, and in another browser use your first tokens to tip yourself... seems a little lame, but tips do bring other tips in and your first few hours on mfc are crucial to camscore. Plus a premium account isn't much, you'd get half back and having a premium account is a wicked feature as a model! At the same time as doing this you'll also be able to see what your cam feed looks like to everyone else.
And like the others said, good lighting, make sure you've checked out other models (and not just the top ones) to see countdowns etc, have your boundaries worked out, they may change which is fine, but know from the start what you think you'll be comfortable with first time on cam. Personally I'd get verified model status on here and check out the new model mistakes part first, but if you want to come online straight away that's cool. I'd also have a twitter page already set up, maybe have a "get to x amount of followers and a sexy pic".
Other than that... try and enjoy yourself, I find standing up and moving around helps keep me motivated and it's a lot more entertaining to watch (not saying you always have to be dancing/standing up, but a bit of variation is nice and brings people to the room). Talking out loud is good too, and personally I'd set pm's as only friendslist, and remember to mute guests/basics! My main new model mistake was thinking guests and basics could tip me and wasting loads of time in pms with total beggars! I remember some dude was ridiculously proud of eventually after chatting to me for ages giving me my first tip (10 whole tokens).
If it doesn't start out well it is NOT the end of the world, but if you do start out well it will give you a big push!
And last of all, good luck!
