You obviously want a lawn to enjoy and do not want a lot full of weeds. With out seeing it first hand, it is hard to say 100% what you will have to do. But on a typical lawn that has problems such as yours my course of action it to apply a liquid herbicide to kill the weeds. read more
No single herbicide, weeding technique or lawn care tactic works against all weeds. How you get rid of weeds in your lawn depends on which you have. Lawn weeds fall under three broad categories: unwanted grasses; grasslike plants called sedges; and broadleaf plants. Most are annuals or perennials. read more