Been there heaps of times and your heading there a bit early for winds.
July August tends to be more eastlys which is dead offshore.
The best time to go is September/October I've had some great sails there September fully lit on 4.2 - 4.7 wave gear
If your really organised with your camping (slightly more than Gnaraloo due to the long drive into town for supply's eg water milk bread.) thens theres heaps of spots in the national parks with a camp host very similar to corros set up, a site dunny and thats about it. Very cheap and right on the waters edge so you can sail rest and sail some more
Its just a long drive to town.
I've stayed at yardie creek homestead before great campsite close to great sailing spots and about 1/2hr drive to the nearest shops. The do a great sunday roast

Heaps of great spots to sail from yardie creek all the way up to the light house. Just look for the kites flying over the top of the dunes will give some great flat water spots. No secrets anymore

2wd fine for everything.
Make sure you go to the potshot motel for a lunch beer and take your board shorts they have an awesome pool in the beer garden
It's a great place to visit
hope I've helped