I'd spray it if i were you and leave the dents alone, it cost me £50 for 5L of synthetic coach enamel, thinners, and panel wipe.
rub down paintwork with 400 grit to provide a key for the paint... dont go through the paint.
mix your paint up as per the data sheet (comes with the paint), or get it as (several) aerosols
spray how it tells you to on the data sheet (prob want 3 coats, spray the first coat VERY lightly)
give it a couple of days to harden fully
thats it
normal masking tape is fine for errr masking
try and minimise dust, you wont get a professional finish but if your careful you can get reasonably close,
Mike