My recently purchased cabinet.

Hello I am new to the arcade controls forum and MAME in general. I recently purchased a cab for 75$ and am wondering if you guys could please help me with some of this... I have some questions and am kind of overwhelmed with all of the information on the web about MAME and cabs, so I will try and keep my questions as specific as possible. Any suggestions, advice, ideas or thoughts please throw them out there be cause I have zero experience in this. I took some pictures of the cab I bought yesterday, please disregard the date on the pictures my camera has the wrong date on it.
here are some pictures of my coin doors insides, how can I tell if this door is still useable? should I keep all the wiring and everything? How should I clean it?


2 joysticks came with the cabinet, here are some pictures, how can I tell if these are 4 or 8 way joysticks? how can I tell if they even work anymore?



I know from reading on these forums that many people look down on using CRT computer monitors and prefer TV's or the actual arcade monitor but for simplicities sake I want to use a computer monitor I think but just in case...

is there a way of testing this monitor and seeing if it still works? I have tried plugging the cabinet it and flipping the switch on the top of the cab but nothing happens
also this box is inside of it, any idea what it is and how to check if it still works?

I know this may be a very long post with a lot of questions but I am definately feeling a little overwhelmed with the colossal task this seems to be. I hope my post is good enough to merit some replies from the knowledgeable people that frequent here.
Thanks in advance.