DO NOT DO IT!!!. Paint and body work is a skill. When performed by someone who is not properly trained, you can and will severely damage and devalue your vehicle costing you several thousand dollars above and beyond what a paint job would have been to begin with. A paint job that is equivalent to a factory paint job will cost at least $2500.
Automobiles are not painted with roll on paint or spray paint. Automotive paint is incredibly thin and watery in it's consistency and must be applied using an air power spray gun. A good spray gun like a SATA will cost about $600. A compressor will cost about another $500. Quality materials will cost about another $1200 if you can get a hold of them. Most of the good paint manufacturers like Dupont, Spies Hekker, Sikkens, House of Kolor and Dupont will only sell to shops and not the general public. You must still buy sandpaper and masking materials which will cost about another $200-$300.
If you do not have the money to have the car painted properly, then do not do it. You will not be able to paint it correctly and you will severely devalue your car.