Don't buy from the House. That's one of the worst snowboarding shops on the net. They bamboozle folks into thinking they're getting a great deal, but what they're actually doing is getting rid of overstock that might be a few years old.
Here are some better shops:
Burton Snowboards and Skis, Burton Bindings, Burton Boots, and snowboard reviews
evo | Skis, Snowboards, Wakeboards, and Apparel
Dogfunk.com: Snowboarding Clothing and Gear from Burton, Volcom, DC Shoe Co., RVCA, Nixon, Oakley, Vans, Reef, DAKINE, Forum, and Zoo York
In my experience, those sites have the best prices and are fairly reliable in terms of customer service. However, I did a quick run through and it looks like they're the pickings are slim from board that might work at your size.
As everyone has sad, get good boots and
try them on. You can get used, but I would have them heated to reset the liner. It won't be quite new and as Avenger said it kills the liner faster, but I have had good experiences with it, and I personally think it's the way to go when you're trying to figure out what fits your foot. There's nothing worse than dropping $250 on boots that fit perfectly in the store and turn out to put you through agonizing pain on the mountain.
If you are sure you like boarding, I would suggest getting moving past the pricepoint range (past $300 or so retail) an all-mountain freestyle board in the $350-450 range. These boards will be the most versatile for you. They are typically moderately flexing, so they won't buck you off at every turn, and if you progress past them freeriding, you can always turn them into more park-oriented boards. They may not excel, but they'll be able to handle most everything you throw at them, short of the extremes (high speed backcountry pow riding, super technical jib tricks, etc). I suggest something along the lines of the Salomon Prospect, K2 Darkstar, Rome Agent, etc.
You might want to check ebay and Craigslist, but be wary and consult with someone who knows what they're talking about, someone who knows the right questions to ask (what condition is the base in, has the board ever been serviced, have the edges been dulled at all, any sidewall damage, etc.). There are some great deals out there, though. I picked up a Salomon Prospect LTD 2006 used in great condition for $100 bucks.
For bindings, you'll probably want something soft-to-medium-stiff-ish without a ton of natural lean. Something along the lines of the Burton Mission or P1, Salomon SPX 45, etc. A lot of people would recommend Rome 390s or Arsenals, but I haven't ridden either so I can't comment on that. All I can say is that they seem very well constructed and designed.
Don't rush to buy. A lot of people do that and ultimately end up wasting their money since they buy crap. Do some research, considers the various factors (what you want to do, how much growth you might have left, etc.) and make an informed decision.