If you want to learn how to win at poker then start with the basics of good hand selection. Forget all the other stuff like bluffing and strategy for the moment, and just concentrate on picking which hands to play and then learn how to play those hands well.
Some players tend to think that they will do better as higher limits but to be honest if you have mistakes in your game the only effect moving to the higher limits will have is to magnify those mistakes and make them even more costly for you.
Start with the basics, and learn each hand one by one.
