need a little help

A friend loaned me beer making equipment that someone had given her. I’m new to this
so I went through what she had. I should tell you that I’ve been researching this for a bit.
There are these 5 liter kegs with this equipment. It also has a hand pump/tapper and
two hand size CO2 doohickeys and cartridges. My understanding is that the kegs won’t
keep with oxygen. My question is what do I need to use these CO2 doohickeys with the
kegs. I also have those rubber doohickeys that go in the top of the kegs and plugs. I know
I lied, I need alot of help, so any would be greatly appreciated.

http://monsterbrew.com/Prod_PartyKeg5L.cfm

is this the type of keg you recieved?

Thanks Pashusa, looks just like except no spout at the bottom. Tried to post pics this morning
of what I have but am having trouble. Took a break and looked in the the draft forum
and think I found part of the info that I was looking for. Again, thank you fit the help.