Well, it also depends on what kind of fabric you want. Wool will cost you; about $1000 for a blazer/jacket, $275+ for pant last time I checked. From what I hear, mens warehouse is decent. Going to a mens clothing store (think old fashion) and finding a good, personal taylor would be a good option.
As for a tie, well they all [somehwhat] look the same, so just go and buy whatever you want. Materials and brand name will differ is what you will pay for.
Shoes, Bostonian will set you back about $150-200. Goldtoe socks are pretty good imo.
For your first suit, I suggest a blue pinstripe, three or four button. Don't get (or call it) a cheap suit; get an inexpensive one. Suits are not generally inexpensive from what I have observed.
Dress shirt will be about $50+. Belt about another $35 to $100. Tie clip thing about $50 (or more for personalized ones or real gold ones).