Can someone help me with my lawn?

We just moved into a house where the lawn was not properly cared for. Now there are clovers all over the lawn, and small weeds. I feel like there are more weeds than grass. The grass is brown in places and needs a lot of help! I want it to look a lot better next summer but we have to do this all on our on, no hiring any one and preferably do this on a budget. If anyone can give me tips that would be great! :)