H.M.
L.-
It really depends on where in Alpharetta you want to live and how much you want to spend... it varies a ton. But here is some quick things I have picked-up living in the area.
1) try to find a neighborhood that has sidewalks/ community pool and playground... they are great ways to meet your neighbors.
2) try for newer neighborhoods- they seem to be very transit (alot of turn over which is easier to meet new people).
3) if you are open to it... look in Suwanee or Cumming... located in South Forsyth... instead of Alpharetta. It's a great area with lots of new developments... but the best part of all your taxes will be about 1/3 less than Alpharetta, Fulton County ( we moved here got a larger house a better school system and pay less in taxes than in Alpharetta.
4) MOPS (mother of preschoolers) is a great group in Forsyth County... and when school is in session they meet 2 times a month... and offer sitting services during the meeting;)
Best of Luck!!!! and I hope your move goes well!
And if you have any other questions feel free to e-mail me I will try to help!... I know some great agents in the area too... so let me know if you need help finding one!