if your a begginer then go to the argos website and get the york stuff.
You wont be able to afford a bench so get a fitness ball and some dumbells. Do you have anything that you can do chin ups on? if not then you need a doorway chin up bar first.
you can build muscle using the floor and heavy objects round the house, but to work your back you need a bar to hang from. so...
1. chin up bar
2. fitness ball
3. dumbells