Cheep do it yourself home repair!?

We bought our home in June of last year and now everyting is falling apart! My 2 year old fell through the floor in the bathroom, The windows leak. the drywall is pulling out from the walls, the lium is coming up off the floors when it rains the water comes in the front door, My husband fell through the front porch and the septic system is flooding our yard! We do not have much money so we have to fix it all ourselves and the cost scares me. Help!