It comes with 4 x 6" Eastons, so you need to add two more stakes for the side guys. If it's not shipped yet you might get TT to add them to your order. I take some 8" Eastons for the end and side guys, leaving two of the 6" Eastons as spares.
There's a thread on here that links to a test of peg holding power. Grounhogs are pretty much as good as Eastons for holding power and weigh the same and are a lot cheaper, but Easton's are nicer to use (easier on the hands and don't collect mud). The former issue can be eased by buying some of these or similar:
http://www.ebay.co.uk/itm/221802202012. The 14mm size are a nice push fit on Groundhogs and clones (at least the ClamCleats clones) - you need a smaller size for mini-groundhogs though.