Hi,
Like Ed says, chuck lots of plants in the tank from the beginning and turn the filter on. I've used the bacteria ampules and other people have put ammonia in the tank and I haven't seen where it makes a significant difference unless mulm from a mature tank or filter is used. The bacteria levels rise and fall at their pace so the only thing that seems to work is "seeding" from another tank.
Also I dose nutrients and CO2 from day one and I see a distinct improvement. Many prefer to wait a few weeks before commencing the dosing.
Cheers,