LittleWatty is selling me one of her 6.6 and I have a few questions.

This is the tank I have now, Betta and Apple Snail included. I plan on transferring all of my plants (2x anubias, java moss, java fern, pot, drift wood) into my tank. I'm not sure if I want to divide it yet, but if I do, it won't be for awhile.
Tank? 6.6 Bookshelf, when you divide it what is the best option to get the best flow? I do weekly siphoned water changes but I have a pet peeve for stagnant water or semi-stagnant. I need a nice soft flow going.
Substrate? Eco Complete. Do you have to change this out ever few months? Or is it mostly a one time use?
Heater? I have two heaters, one of those cheap-o made for 2-5 gallons but it hasn't failed me yet, I also have one meant for 20 gallons that i'm using in my 5 with great success. Do I put them both in, if divided? If I don't divide i'll just use my bigger one.
Lighting? I plan on putting in a lot plants, slowly though, since my budget is a bit short right now. I'm not opposed to getting better lights because I heard the ones it comes with aren't always so great? If I should change them, to what, and where can I get it? Note: This tank will not have plants that NEED a lot of light!
Fertilizers? I'm really looking for a limited tank that won't need a lot of additives (like c02 and root tabs), but i'm willing to add some liquid fertilizer to keep my plants happy and healthy. Sad part is, I don't know a lot about those. Or anything at all. xD I WILL have eco-complete though, will that suffice?
Shrimp/Other? I really want to get some shrimp, my betta is a bit aggressive though and I don't think he'd play nice with them, although he's left the snail alone just fine after he learned he couldn't push it around. What kind of shrimp should I get, and how many?
SORRY FOR ALL THE QUESTIONS. I really want a SIMPLE NPT that's going to be cheap and not really take up a lot of my time every day. I don't want to go into some crazy plants that are going to need me to bend over backwards to keep them alive. I want a low-light and low-fert tank the best I can. I really just want a better home for my betta. If you could post your own Bookshelf Aquariums i'd really like that! :)