The shorter term your investments, the more experienced you need to be to make them work.

If you're trying to make money on 24-48 hours price changes you need:

[1] - to be using charts and have plenty of information including MA and EMA profiles, moving average convergeance-divergeance profiles for short and long term cycles, volume statistics for each significant price move, a realtime trading calculator with averages and reaches and a full, realtime order book readout

[2] - about 3 months experience with all of the above at least

If you don't, you'll just get eaten alive by those that do, unless you get lucky which will only be 1 trade in 5.

Otherwise, put some money into something that you like the look of and wait a month.