No offense but Yogee is right, no one is going to participate right away since you're just a newbie. Even if you have a decent reputation there's not many people interested here because iirc someone did the same few months back, their raffle had more slots and each slot cost less but in the end their raffle didn't go through since the slots wasn't filled. Also some people discourage using random number generator for picking winners.
Agreed. Plus this kind of "gamble" is very dangerous since the one that has the funds is not known and still doesn't have a very good built of reputation and trust.
@OP, of you'll do it, better to hire a trusted escrow, probably some will join in. It will have very few participants IMO.