Your instructor will be your best bet for repair advice unless you post pix.

Elec. pumps are nice, go ahead and get a manual also, someday youll need it.

Air tool oil works, I use AT fluid.
I used to use nothing, for my 1st 2 yrs, then, BAM! Bearings are not nearly as easy to install as oil, trust me here. Now I have a one week rule, if no fli, earl it down.

We dont use air filters at our field, at least I dont ever remember seeing one. As far as I know, its never caused any problems, though I dont see how it could hurt either.

Dont go fly unless theres a voltmeter available to you.

Million different boxes out there, get what suits you.
WELCOME!!!!!