i'm guessing that you want to start off practising painting with just a paintbrush?
search on youtube mate. there are heaps of vids available.
Jin Saotome and
Spurt Reynolds also have really great guides to painting transformers.
Radicons also have quite a number of custom ROTF devastators which you can "borrow" for ideas.
the basic and most easiest formulas to use are the same:
-clean the figure in warm soapy water
-tape up areas you dont want to paint with masking tape
-spray paint or hand paint a base coat over the figure.
-dry brush on top (note: get use to the idea that you are going to waste a lot of paint but fark it, at $3-$4 a tub, you'll survive)
practise on a junker figure or some random plastic pieces first if you are not confident with your painting skills.
that should help get you started.
