WOW, Some really GOOD stuff here. I almost feel like I have walked into a support group of sorts.
Along the whole L2 line: I am assuming by now you have watched a couple youtube videos on L2. If not, Essentially although still incomplete, it gives you additional information that the regular "bid/ask" quote doesn't give. It breaks down the realtime buy/sell offerings by the various market makers and on TDameritrade, it doesn't break it down fully but also shows the actual buys and sells.
The main things you need to learn are first how the number of shares on bid and ask will likely impact price movement and how to recognize the different market makers(MMs) and their reason for being there. For example some primarily just buy and sell retail for their own customers like you and I. And others are more institutional and are primarily selling shares for either the company or creditors of the company. Others do both. If they are selling shares for the company or creditors, you will hear folks talking about dilution. Basically they are inflating the share structure by introducing new shares into the market for one reason or another.
And as the general economics principle of supply and demand dictates: as supply goes up demand typically goes down and can negatively impact the price accordingly. That is unless there is enough interest to out pace the supply(good news, favorable filings, ihub pump group, etc. When this happens you get a "run" until it reaches the breaking point where the table turns and supply now outpaces demand and it starts going back down until supply and demand stabilize.
I will elaborate on it at a later time as I am getting ready to head out for father's day, but the other thing that is critical if you are going to "invest" in the penny stock arena is learning everything you can about "toxic lenders", who the players are, how they operate and how they influence the stock and can sometimes ultimately destroy a company's share structure.