Tunze 9002 Skimmer

I am really new at this.  I have a Biocube29 and just ordered and received an InTank Media Basket and a Tunze 9002 Skimmer.  Oh my Gosh I have no idea what the skimmer should sound like and how quickly I should start seeing foam.  I had to add a lot of water and the water is now way above the "max" water line on the side of the tank for those of you who are familiar with biocube 29s.  I'm not sure if I now have a little too much water or still not quite enough water.  I don't know how much to open the air screw either.  No bubbles are happening right now.  However, I have had my tank for 6 weeks.  I purchased cured lived rock.  I have been doing two 1-gallon water changes per week.  I have been testing my water all the time and levels are really good.  I purchased 2 clown fish two weeks ago.  Have snails and hermit crabs for cleanup crew so far.  Have also purchased 3 small soft corals.  Is it possible that my water is so clean I'm not going to see any bubbles.  I think I had the air screw open too much because it was making so much noise and still no bubbles so I have turned it down.  Is this just a waiting game for a few days to see foam start collecting?  Sorry ... I have read and read as much as I can, but it is really hard to know how much noise I should be hearing and whether my water level is just right.  Anyone have any advice here?

My skimmer fits into the first chamber of my biocube so I don't really worry about water levels there. The 2nd and third both fluctuate so I try to keep it 3/4 full which requires some top offs every few days.