Aleman, I ussually dont like getting involved in "how to price' posts. But since noone has answered you, here goes....
You really need to know your market. You might get 100 different guys in here giving you different prices because we are all in differnt markets.
So, how can you find what your market will bare for pricing? You might want to ask someone with the large national companies. I'm sure you see them around, just stop and ask what they charge for X sf. And, every time you see a truck, whether it be a national company or local, ask them. You'll most likely get a range of prices. Now figure your price. Keep in mind what the compition is charging, but you must know your numbers as well.
How much does the product cost you to apply per 1000sf?
How much time is involved, time to drive there, time there, time to drive away from there?
What is your overhead costs? How much do you need to charge to break even, how much do you want (or need) to add on as profit?
It aint as easy as just asking how much to charge.
And let me add this, its been my experience that guys who do a full service (like it sounds you do) often charge to way to much or way to little.
Now I'll tell you what we charge for 5,000sf.- $42.50 for a fert/weed control application
good luck