Toss in the meat first (unless you're using canned fish), leave that for like 5-10 mins to properly cook on the hob, then toss in the veg. Leave the veg to cook for a little bit, then add the tomatoes (then add the canned fish and stir it in, it'll practically dissolve into the tomatoes and give you this lovely rich flavour). If you're adding potatoes, put the potatoes in after the tomatoes.
Own a pot. A nice big pot. Preferably a saucepot, but a little bigger. Buy yourself canned tomatoes, some veg of choice (I like to use carrots, onions, bell peppers, and chopped potatoes), and a meat of choice (good ones are mince or canned fish like sardines if you like them).