FISHING and COOKING
Fishing and Cooking fit together like that. And 'that' is pretty damn good
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For your initial cooking, cook some of the beef you get from killing cows early on in your combat career. Otherwise, you'll be cooking the fish you catch. Fishing stores in Port Sarim and Catherby should supply all your Fishing needs.
For cooking your fish, you can either fish it all raw first, then cook it all at once at Draynor. There are two different trees you can use right outside the bank. In Catherby you can cook the fish on the range right above the bank or bank right away and cook later. The same applies for the Fishing Guild.
From 1-5, Net Fish shrimp at Draynor. Cook it outside the bank. You can bank it and save it for your cat. From 5-20 bait fish either at Draynor or Catherby. From 20-50+ (possibly even 70+ to make lobsters that much faster), lure fish with a fly fishing rod and feathers on the river south of Edgeville, and bank there. Your next step will be lobsters at Catherby with a lobster pot until 68, when you can enter the fishing guild and one-click lobsters
. Harpooning tuna and swordfish is another viable option, but you may want to wait until you have a good chance of not burning the swordfish when you cook them. On that topic, you can get Cooking Gauntlets from the Family Crest quest. It requires 59 Magig and 40 Smithing/Mining/Crafting. Try and do that before you start any longterm Fishing and Cooking.
Only harpoon sharks for your own combat needs or if you need money, otherwise lobsters would be the best overall experience.
An additional note: If you have Avantoe herbs lying around and have the herblaw level (50) to make Fishing potions, make them and use them while fishing, since you probably won't be able to sell them, and fishing potions are the only potion you can make with that herb.