You will need direct sunlight. indirect sunlight is sorta like reflecting a normal grow lamp off of a wall then onto the plants. They may grow a little, but it really isn't effective. Obviously, you can always move it indoors and throw it under a bunch of cfl's if you can't be in direct sunlight for whatever reasons.

Perlite is a very good idea, especially since you are in such a humid climate. t will help the water drain from your soil which prevents a whole bunch of problems.

You might want to start thinking about nutrients. If you can order online or if there is a hydroponics store in your area, you can easily find high quality nutrients. Otherwise generic plant food will work. either way, remember to start with small doses and work your way up.

Do you have a way to check Ph on a regular basis?