Decomposition of subject area

Can you recommend any books or other tips about how to decompose subject area for applications (currently using java I mean OOP).

I read about SOLID and patterns, but have problems with these questions when I'm trying to create an class etc.

1. What methods I need here.
2. Where exactly I need interface and where abstract class.
3. Links between classes. How to make it right. (It is most hard for me)
4. Thinking about future modifications and how to write code with this thinking.

I understand these questions seems about pattern/base logic, maybe I need more detailed examples.

In the Bruce Eckel's book there's a quote - "However, other people may not get the big picture concepts until they’ve seen some of the mechanics first; these people may become bogged down and lost without some code to get their hands on. " It's about me.

Any suggestions?