Skimmer Setup? What type of filter materail?

[Rex32]

Can anyone give me some input on how this skimmer should be put together and recommend an air pump to use with it?

Here is a picture of the Skimmer:

 

I also need some input on what type of filtration to setup. It had BioBalls in it before but I was able to get them out. It also had a felt screen/pad on top of the bioballs for larger items I presume. Here is a picture of the back:

Also here is the felt pad thing:

 

Thanks a lot,

Mike