I'd suggest that you try a couple of trades with small values to get used to the platform before you go for your next planned purchase. You'll go with experience and more knowledge and won't be disappointed.

Also, pay attention to the "Deposit timer" and set it accordingly to your needs. I always set the higher time possible (7:59 hours), in case I go to work, or get busy or distracted with anything, or I go to sleep, etc., so that I make sure that I always have time enough to make my deposit.