If this is your first time with discus and a planted tank i would do one of the two:
BB discus tank (bare bottom) no plants/gravel.
Planted tank with tetras.
Once you have 'mastered' one of the two it will make the combination of the two much easier. I kept planted tanks for 5yrs before I added discus (not that it takes that long to 'master' the planted aquarium).
The Hood you are using will not be good for a planted tank unless you retro-fit some better lighting in it. You will want 60-80Watts of light over it to give any plants a fair chance.
Filters will depend on what type of planted tank you do:
High-tech planted tanks with CO2 will be best with a canister filter. For a 29gallon a rena XP2 or Jebo828 would work fine.
Low-tech planted would be fine with a good HOB filter like an aquaclear70, or two. Two HOB filters are nice since you can alternate cleaning of the filters, clean one on even months and the other on odd months.
Here is a good place to start for planted tanks:
http://rexgrigg.com/
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