You're a brave man if you brave the waters in a 3/4!
Langebaan main beach or Shark Bay you'll get away with a 3/4, but Table View (bloubergstrand), water is cold. Even if the air temp is 30-40deg c the water is chilly. Do yourself a favour and take your steamer.
Kite size wise, 9/7 unless you have space for a 12 also which would be nice if you wanted to get out earlier in the mornings. South Easter generally starts to build late morning and usually gets progressively stronger thru to evening. It can blow its tits off some evenings.
General rule also if its honking in Table View, head up to Langebaan where the wind will generally be a bit less bonkers. Klein Oesterwaal ( Shark Bay), is awesome flat water spot knee deep, whilst Main Beach just up road is deeper but just as good. Beware the strong current at Main Beach- many a board lost here......!
Kites Nest has a good reputation. Brad Simmington bit of a local legend there ( if he's still there), and they and others do the Downwind Shuttle in season which will enable you to downwind from Sunset Beach all the way down to Haakgat if you wish (awesome wave spot but evil shore dump so beware).
http://www.thekitesnest.com/windshuttle/downwindshuttleTwo more local forums if you need more local advice:
forums.ikiteboarding.com/forums/20/ShowForum.aspxdirtyhabits.org/Plenty of accoms to choose from either at the kite schools/ centres or private. Depends what kind of accoms you after. Aforementioned Kitesnest has accoms in Blouberg, and Windchasers up Langebaan is nice backpackers type accoms.