Started messing around with this over the weekend and after a rocky start (my first two battles saw me losing due to drawing a ton of high-cost creatures but no mana) I'm really starting to enjoy it. This is my first time with MtG in any format, and I'm surprised at how much fun it is. Will likely have some questions as I try to figure it all out...glad there's a few of you around here who actually know what the hell they're doing.
Don't be afraid to mulligan too. First one is free, and even going down to 6 cards isn't necessarily bad, especially if you go second ( when you go first you don't draw a card ).
Try not to keep a 1 or 2 land hand ( though some decks can do fine with 2, mostly not though ). Likewise, never keep an all land hand, I also wouldn't keep a 6 land hand because then you are mostly hoping for top decks ( drawing something useful ). Again, there are exceptions to the rule, but you will find your games go better if you start off with 3 or 4 lands in hand
edit: if you have this on your iPad, feel free to add me to your gamecenter - I'm Cragmyre. If you have this on steam, I'm Cragmyre there too. Yes - I double dipped