So, my question is - how do I know if this is legit or not before investing?
Their fees would be 15%.
Thanks
All you can do is to ask some of the other people first before investing on a certain coin like what you are currently doing. Gather information about that coin so that you can avoid scams in the near future. You can try to use telegram and join some bitcoin groups and try to throw some question there about your concern. Do not trust anyone so easily just because you are in need of money.