ther have been plenty of threads on practising.
Please use the search tool.
As you probably wont, Im just gonna give you a very short discription of my method.
I practice sleights/ moves on its own repeatedly. This is just so i can perfect tricks.
I mainly practice by watching others. Kinda ironic. I watch others to understand presentation and how they execute a move subtly. I learn how to justify each move with a reason, then the moves will come naturally as you understand what you are making it look like.
As for books, I read through it. May not be 100% thorough. I see things I like, I read more indepth upon it, understand it, practice it, perfect it, then I see what I can change. As for the other material, I may not like it. Whats the point of practising something youre not going to use? I either just understand and ignore it, or I try to change it to my style. 4/5 times even if I changed it, I hardly use it.