You may get some responses recommending this market to trade, or that one to avoid. I think, however, that you need to evaluate your situation first. What market(s) can you actually trade and in what timeframe(s)? How much time can you (and do you intend to) devote to the trading and during what time(s) of day?
If you can answer that, you can narrow the list of realistic trading options down.
For example, you would have a hard time daytrading US stocks if you can't be active during a sizable portion of the US trading day, but maybe your schedule works out so you could daytrade forex or one of the futures markets.