Thanks everyone.
I'm thinking of a few ideas.
1) I was thinking of getting top soil and covering my lawn with it and seeding it. Doing this in the summer. But found out that the cost to cover my lawn with top soil is a little more than a 1000.
2) getting herbicide and kill all the weeds. Leave for two days. Then seed on top of what I have without any top soil. I would just have to seed more, but I don't know if the seed will turn to grass this way.
3) do both 1) and 2). So putting on top soil after the weeds are dead.
4) recommend an option?
What do you guys think?
Thanks again for the replies.