Tensioning alternator and power steering/AC compressor belts and pulley

Okay, I recently changed both belts on the alternator side and power st/AC compressor due to the belts was making noise.I installed the new belts, when I start it up when the engine cold only, it would make that squeaking noise, but I noticed that the alternator is a little back is that normal? A next thing should I use belt dressing on the belts. What I was thinking was to take off back the belts and clean the pulleys with alcohol and put on back the belts and see how it runs and inspect the pulleys for bad bearing as well as the belts moving side to side, greatly appreciated for the advice.