Well, first of all, look for a track record. Get 1 year performance on a LIVE account. I don't know how many clowns show a demo account statement or some backtest statement. Get drawdown and risk information like the number of lots traded vs. account size. Ask them about money management as well, but I assume it will be some kind of % based of account. If you see really large trades as compared to the account size, these guys are not in it for the long run. Funds are built slowly over years unless high risk is taken. Ask them what type of strategy they are using...trend following / counter-trend..etc etc.
For example, if they tell you they use some kind of martingale strategy, then I would be wary.
PM the details if you want. It may be worth looking at.