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skip the bio-balls they become nitrate factories. Live rock is your primary filter and once you get a skimmer that's all you'll need. You can turn one of the back chambers into a refugium filled with chaeto and live rock.
Sounds like your off to a great start. What are you water parameters as of now? If ammonia and nitrite are 0 and nitrate is less then 5 then you can start adding a clean up crew
29 gallon-planted community
20 long frag tank
75 gal-planted goldfish
75 gallon mixed reef with 20 gallon sump