If you buy them tinned, they are already cooked.
I think the tins of brown chickpeas that are sold in some Deli stores have more depth of flavour than the cheaper Supermarket ones.
I like to be adventurous with dressings and will often make them a good part of the nutritional hit of the salad.
This makes enough dressing for a week of big salads:
1 whole aubergine - stick it under the grill on high heat, just resting on the bare bars of the oven rack but with a baking tray below in case of drips - turn it occasionally and keep grilling until the skin is blackened all over and the whole thing is very floppy.
On a plate, cut the grilled aubergine in half and scoop out all the pulp, and blend with:
Half a can of chick peas (the rest can go into salads)
Juice of a whole lime
Raw garlic to taste (I love garlic and keep bags of frozen chopped garlic in the freezer at all times and will use about 1 tbsp that's about equivalent to 3 large cloves of garlic but you might use less if you prefer)
1tbsp olive oil
1 pkt fresh basil
Salt & pepper to taste.
This gives an amazing zing to salads and I'll use it generously not just drizzle on a tsp
I make loads of other flavourful dressings too and the general principle is that you can't really go wrong if you include some cotrus and garlic you can blend that with any of dozens of other things to make something delicious. Other things I have put in dressings (not all in the same one, just pick 2 or 3 to see if you like the combo:
Roasted peppers
Roasted fennel
Roasted butternut squash
(not usually done specifically for a dressing - if I make a dinner that requires a roasted vegetable I will plan ahead and pop some into a tupperware)
Various nuts
Garden peas
Rocket (whole packet)
Various other fresh herbs (not anything with a woody stem like thyme/oregano/rosemary - just things that the whole pack can be bunged into the blender)