I don't know about Pharo, but I have seen very few IDEs which make it as easy as Smalltalk environments (e.g. VisualWorks) to do what you asked for as they provide you with GUI a for all that stuff. Pharo is probably no different.

I think the first important step, is to understand the different columns of the 'System Browser'. From a quick search that video playlist might help you:

https://www.youtube.com/watch?v=0xF4fnGaE2w&list=PLqbtQ7OkSt...