If there are any favourite dishes of yours, do a mnimins search to see if there in a SW friendly version.
I would say extra lean meats, wholegrain rice and pasta, lots of fruit and veg, tinned tomatoes, oxo cubes and herbs and spices are pretty much always on my shopping list.
If you like spicy stir fries then buy some fine egg noodles, lean stir fry meat and packs of stir fry veg. Cook it up with an oxo cube, soy sauce, and spices (Cajun is my fave - tastes like sinapore noodles to me). So quick and tasty.
Chilli or bolognaise are tasty and easy to include lots of free veg in too.
Like the others said, it's hard to know where to start without knowing your tastes.