This is only my opinion so make sure you look into it yourself, but the best account would be a combo of:
1. - access to the markets you want
- $$ lowest commissions
-reliability (Look for something with a good name on the forum is a good place to start, though don't end there!)
2. Have you looked into different kinds of trading? e.g. do you know the difference between EOD and daytraders, swing trading, scalping, investing, system trading, etc.
A great place to start is here:
https://www.aussiestockforums.com/forums/showthread.php?t=14370
https://www.aussiestockforums.com/forums/forumdisplay.php?f=7
3. Yes, the possibilities are endless as long as you can prove profitability with the way you trade. Whether you want to put your orders in each morning and night, or be on the maintenance train and check your position all day and adjust accordingly is up to how you learn/want to trade.
4. Yes, I trade the US treasuries futs, and the Singapore index; again there are a world of possibilities.
By the sounds of the stage you're at, the biggest things right now would be to save as much money as you can working your job and then when you finally come to time to trade, risk about 99% less than what you think you'll be able to handle.
All the best with your journey. Don't blow up!!!