What tools needed for engine rebuild?

Others have already said: books, basic and specific tools/equipment.

I think paper is good; write down what you want, it helps to clarify thought, plus it's cheep.

Something else that is important for you would be a mentor; a singular go to person for your questions. While the vast reach of the internet is good, I think your inexperience ( I could be wrong here, and if I am, I apoligize) too many people giving advice is just gonna confuse you; again, paper, it's cheep, helps to clairify thought.