1x set of Cams (buy intermittent sizes when you start and fill the gaps later)
1x set of Nuts
Possibly two or three big hex's (replacement for the big cam's you dont have)
Belay device (with lock biner) Grigri's are not to be used for Trad climbing
3x Locking biners (at least one should be large pear shape)
10x Quickdraws
4x 30cm slings
2x 60cm slings
2x prusik loops
1x Nut tool
1x Helmet (think Brain Bucket)
The above I would say is for a route on Table Mountain. If you were crack climbing in the States you might need 4 of the same size cams, this doesnt happen often in SA.
For Country climbing add:
1x Headtorch
1x Knife
1x Water
1x Cellphone
1x Emergency blanket
1x Tibloc / Ropeman
1x set of teeny weeny nuts
Did I leave anything out? 1x
RAM have a recommended gear list at
http://www.rammountain.co.za/rockclimbing.html