What is every thing you need to use it.. mine came with 3 mats. i know you need cartridges what else do you need? do you need like ink and stuff?

I haven’t purchased anything from the Cricut Outlet, but it appears to be a good website. They also seem to offer a pretty good pkg. (or Cricut Bundle) 352.96 for the machine; 3 cart’s plus the design studio (the Design Studio is expensive in and of itself….like 55.00 to 65.00) The D.S. is a good tool to have, especially if you’re going to build up a collection of cartridges. It’s a good tool to weld and build words (except for what’s predesigned in the cartridges). This is not a bad deal at all, considering all that you’re getting.
In case you’re shopping for a Cricut Expression, and FYI only: A Cricut Expression has been going between $289.00 (at WalMart) but it comes with only 1 cartridge; or between $324.99 to 349.99 w/2 cartridges (also at WalMart); Also try A C Moore Craft Stores (available on the website too). They have sales periodically. When it’s on sale, they sell it as a bundle, for as low as $319.99* (*in store only). It includes 4 cartridges; ink w/standard items (cable/elec. outlet; mat board). The bundle is still available on their website, and shipping is minimal. Cost is $368.99 (best price if you want/need the 4 cartridges). Another source is www.ohmycrafts.com. (I just purchased my Expression in May by going into one of the A C Moore Craft Stores* in Florida)
Hope this helps you with your choice(s).