eg-: examples to create dfa, nfa, turing machine, pda, regular grammar, cfg problems etc. What is the best resource for it? Any book there? Or any thing else there?
The resource you probably want is JFLAP, created by Susan Rodger at Duke University. It is a software system (in Java) in which you can create automata of all kinds and run simulations on them.
Note that from the link above, you can reach the JFLAP book as well.