That's pretty good advice, but I'd hold off on spending it on legal affairs until you really need to. $5000 gets you a long way when it is spent on hosting and bandwidth, it's a drop in the bucket when you are spending it on legal advice and incorporation fees.
Use your $5,000 to leverage it to get you another $10,000 or $20,000 in sales, then start thinking about another round and spending money on legal advice and other niceties.