There's been a lot of good advice in this thread so far, and I can tell you have an excellent attitude thus far towards learning the game kcjb.
One thing that strikes me is that you may be doing a bit too much studying, and not enough experiencing. It's very good you are learning the ins and outs of where to sign up and how to take advantage of bonuses and promotions. This is one of the things I think people who rush in and didn't research regret.
However, in regards to actual playing strategy, I think it's important to strike a balance between time on the tables and time learning/theorizing. One of the greatest teachers can be your own experience -- and accruing many situations and hand histories from which you can draw upon with firsthand insight is important to any poker player. Playing a ton also will help you figure out what type of games and formats you enjoy most.
For this reason, I think playmoney is a very good way to get started with getting some hand experience and testing the waters of different formats (cash, 6-max/FR, SNG, MTT, etc.). Playmoney is an excellent risk-free way to get some hand experience and to just work on some basic reading skills. The level of play at the lowest rungs of playmoney is generally ridiculous, but if you can build a playmoney roll you will start to see more competent players at the upper echelons of the playmoney tiers. You will sometimes even find better play at the tops of the playmoney tiers than you will at the lowest rungs in real money
, depending on the site. Some will say that play money is too unrealistic and will teach you bad habits -- this is probably somewhat true. The thing to practice is to be able to read and classify your opponents, and to be able to adapt your game according to the situation -- there are a lot of terrible playmoney players, and also some really good ones too. The same thing is true in real money, and you need to be able to discern the differences more quickly in real money.
Also, realize that NL Hold 'Em is super popular right now, but there are many other forms of poker that could be equally or more enjoyable to you and that you may be able to capitalize on even better.