Cycling a 90 g tank

I just bought a 90 g tank off of craigslist that came with two red devils. I set it up and it is running currently but I did not do the cycling process as I was unaware of the cycling process until today. I'm going to cycle the whole tank so where should I start?
What I was thinking of doing is siphoning out the water into a smaller tank to keep the fish in while I cycle the bigger tank, then siphon out the rest of the water.
Next I'd fill the tank back up with water, add water conditioner and some aquarium salt.
Then add two small oscars (about 3 in.) and then just wait for the ammonia and nitrite levels to decrease and the nitrate level to increase.
Does this sound correct?

Oh yeah another question is should I leave my air pump in the 90 g tank that I need to cycle or should I put it in with the tank that has the fish in it? Also what does it look like when my tank is done cycling? Will there be lots of dirty things on the walls, will the water look clear?

Yeah the fish were already in the tank but I cleaned the tank out and the gravel out with a hose. I don't think the previous owner had established a biological filter anyway. Well right now I got new water and I put in three feeder goldfish. The water tested to have no ammonia currently. Now all thats left is to be patient right?