Just do a fishless cycling...
Set the temperature of the water to the mid-80's
In de-clorinated water add
5 drops of pure ammonia per gallon daily
Take nitrite readings
when you get a measurable reading,
drop to 3 drops of ammonia per gallon,
continue this till your Ammonia and Nitrites read zero...
Do a large water change 50-75% with declorinated water
Adjusting the temp to the fish you are going to keep.
and your tank is cycled...
You can speed up the process by "seeding" with media from an established tank...