Best way to actually get rid of weeds and such is to call a professional out. Not trugreenchemlawn, an actual professional. There should be a few in your area, look them up in your phone book.
Although you may think you are comming out ahead applying your own fert and weed control you could just be wasting money. Professional applications are not all that pricey and the best part is you dont have to worry about the right time or rate or product to apply. I know, I sound like a salesman.
If you are dead set on applying your own try posting your question in the fertilizer/pesticide/herbicide area of this site.