I suggest purchasing the DVD set from Welding Tips and Tricks. I think they are about $9 ea DVD shipped and there are two or possibly three in the set by now.
I have the first two. In addition to providing good general information on various types of welding, Jody Collier demonstrates how to set all of the multitude of tig welding controls and explains what they are for. As luck would have it the machine he uses for the demo is the exact machine you have just purchased.
I watched his DVD then set my new machine for it's first usage on aluminum. I was able to run a nice bead straight off using his suggested settings. The info he provides will get you pointed in the right direction and is well worth the price of the DVD set.
Glen
Everlast PP256
Everlast Imig 200
Everlast Power Ultra 205
P&H 400 amp A.C.
Miller 230 amp with Onan power