Paint?

I bought myself a Chip Ganasi Reynard plastic model car for Christmas, and since then I have gone and bought myself the following jars of paint:
1x black Tamiya black enamel
1x red Tamiya red enamel
1x clear aqueous (no name cheapy)
1x white aqueous (no name cheapy)
1x field grey aqueous (no name cheapy)

What do you suggest? Ditch the aqueous? Invest in a spray thingy? Buy spray cans? ?

I work in a model shop and i say ditch the lot buy humbrol.
and i thought tamiya only do acrilic as that is all we sell and we were until a couple of weeks ago the main dealer in uk.

Looking at the bottle now, its pretty much all in Japanese, the only english bit says "enamel pain- red" :(

How old are they??

Dunno, but they don't look too old...