Buy wall #1 (example=8170) is the one to take & hold if sold to, buy wall #2 (example=8065) is to push the price up.. If the buy orders outweigh the sell orders (BTC), the price will rise.. If there are too many sell orders (BTC total on both sides), people will sell as they will think someone is going to sell big & the price will go down.. There are to many ways to look at it, but I will try to explain later with a detailed photo  

P.S. I'm still somewhat new as well (6mo or so this year, but started back when BTC was only $80), but have been doing a lot of research for the past few months (12-16hrs a day, most days are spent just watching the markets & a lot of Google/Bing videos)..

Edit:Buy walls #3, #4 & #5 would be @ 5005, 2000 & 1054 = Failsafe from the price going down too far again.