[Bert H]

First off, let me point you to some reading:
http://www.aquatic-plants.org/articles/basics/pages/index.html
http://www.rexgrigg.com/
http://www.aquaticplantcentral.com/...ums/14684-new-tank-setup-guide-parts-1-a.html

A few comments on your set up. 96W over 20gal is a lot of light. You're going to need CO2, and a good fertilization regime. You might be better off getting an appropriate cannister filter rather than the 10gal sump set up. Heck, the 10 gal could become a nursery/grow-out/quarantine tank.

 

[Bert H]

It will hard to maintain decent levels of CO2 if you go with diy, using that sump, because you will de-gas a lot of it. Pressurized seems to me, to be the only way to go there if you keep the sump. As far as ferts, you can go the dry route, by far the cheapest, or get it from Seachem or Pfertz which will have all the individual ones ready to go.