For help with commands, I find that the O'Reilly book, "Linux in a Nutshell," subtitled "A Desktop Quick Reference" to be very handy.
It turns out you can get it free in a pdf download, but it's over 900 pages, so I'm not sure how useful that would be. Here's the url: http://it-ebooks.info/book/403/
To buy it, it's $50, or it was when I bought mine several years ago. (I have no connection to or financial interest in O'Reilly books.)
I find that I use it about once a week, and I'm not even a programmer!
Relative to rpms: Most (but not all) of what you'd like to use is available in the PCLOS repos. However, rpms designed for SUSE or
Fedora will usually work, even tho not supported. IOW, you won't get any help here if you use one of these programs and it doesn't
work, or crashes. There is a category in this forum where you can ask that a certain program you'd like to use be added to the repos.
Read the instructions as to what you information you need to supply when you request an addition. And there's no guarantee that
it will be added, , , ,
Good luck with it. --doug