you'll need at least a combat level of 15, at least 2 weeks of playing runescape, together with a hp of more than 12. Otherwise the lobster will prove indeed tricky to eat. :P
hrm, the combat skills shouldnt take too long, you should get them within a 4-5 days, other than prayer. fishing and woodcutting can be done in a day. crafting maybe in 2-3 days. cooking should be pretty fast, if u cook what u fish. hard to gauge for runecrafting, but will probably take a week.
weird, feathers really sell good for me. sold like a couple of thousands lately for 10ea. you can also try cutting willows and selling them for 30ea. if u can raise your mining lvl higher to 41, mine iron. they sell pretty good.
if you dont want to spend any money, just head down to the crafting guild. everything is available there to make all the pottery stuff. and bring your pickaxe.
cut 10 trees. cut them into arrow shafts. add 150 feathers. get 10 bronze bars and make 150 bronze arrowheads. add the arrowheads to the headless arrows. cut 154 logs, cut them into shortbows. cut 126 logs, cut them into longbows and there you are, lvl 15 fletching.
go to edgeville dungeon and kill chaos druids. take all the herbs that they drop. get the secondary ingredients and use all your herbs to make potions.