Doubt: How to customise Debug options in codeblock C++ and what things to take into account when debugging

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C++

GCC

debugger

g++

Hi, there are a few things I like to ask related to Codeblocks IDE with GCC/G++:

1) I'd like to know if there's any good tutorial or web explaining how to exploit gcc's debug options. What I mean is, my intention is that when I use the 'debug' build instead of 'release' build, I want for example, that through the console, it shows me cout's or other function call that I put along the code.
But I don't want to compile that code when I want to build in 'release' mode. Is there a way to accomplish what I mean? I know there is since I seen it somewhere else or it has been commented.

2) What other things should I take into account to debug? For example, classes related in c++ to debug? Or third-party libraries?

Thanks.