TUTORIALS
I have compiled a list of tutorial sites which I know will help you (experienced or inexperienced).
Everything you will need to know is here so please browse, read, study,  and practice
the tutorials for your skills to be honed.
Wish you all the best!
Sakurahana.
Senbonzakura.
Unblessed.
A fantastic tutorial for denoising:
Franky-House Denoising Tutorial
Remember, there are so many ways and differing opinions on how to clean pages.
But always try to look at past releases of that series and clean in order to make it the same style; this is very important to all aspiring scanlators.
Don’t view these tutorials as a concrete way of cleaning manga.
Experiment for yourself. This is all just to show you the basics!
It’s up to you to come up with an effective (and hopefully very efficient) method for cleaning/typesetting/whatever.
Good luck with your training!