I'm not a lawyer and this is not legal advice.
I recommend finding a lawyer and an accountant that specialize in crowdfunding. Legislations on crowdfunding is constantly changing so keeping up with it on your own will be a nightmare.
These types of platforms are still relatively new so It might be hard to find reputable ones with good track records.
If you would like help finding reputable lawyers and accountants that specialize in crowdfunding, I can help you with your research.