Welcome to the game! I'll focus on recruiting, since that is your first big task:
1. Don't spend much (or any) of your money early in recruiting. The longer you wait, the more borderline D2 players will become willing to play D3 ball because they're not getting any interest from D2 programs. For me, it was very difficult as a beginning D3 coach to avoid jumping on players right away and spending a ton of cash in the first few cycles - but this is NOT the way to succeed. If you have the patience, you can even wait until the morning of the last day of recruiting to begin. You will get better players that way!
2. Ditto for FSS. Wait until after the first signings to spend any of your FSS budget, because lots of players will have already signed with other teams by that point. That will cut down on the number of available recruits in each state, which will lower the cost on the states you want to scout. With a D3 budget, it is dumb to scout states when they are still fully populated.
3. AVOID BATTLES. Can't stress this enough. In D3, there is almost no reason to EVER battle another human coach for a recruit. All it does is bleed money from your (paltry) budget. There are enough players out there that you'll be able to find someone similar without having to battle for him.
4. Spend as little as possible per recruit. On the last day of recruiting, players will often sign for, say, one eval and a promise of ten minutes of playing time. No reason to go crazy spending on a guy, especially in your situation where you only have four returning players. Sign 'em as cheaply as you can so that if there is a guy halfway across the country that you want, you'll have the cash to woo him.
5. I don't normally like to give heavy promises to a recruit, but you know you need two starting guards - so again, in the interest of spending as little as possible, wait until late in recruiting. At that point, you can sometimes sign guys for $110 - the cost of a promise to start, plus the $100 cost to offer a schollie. So keep your two starting guard spots in mind as you are checking out the recruits; whoever looks the most ready for prime time may be landable for just a promise. (One of the best players I ever had in D3 was a $110 signing like this.)
Good luck, and ask questions in the forum whenever you need help - you'll find most people around here are helpful, and some threads even make it all the way to the second page before anyone calls someone else a moron or a Nazi, LOL.