They're just being really immature Good luck with your goals, none of them are too impossible to achieve, so you probably will be able to do it. Try not to get too bored on the way. :P
The other guy in the picture is wearing desert robes, as you said, but they mean the princess outfit in the inventory. It will change when he tries to wear it.
The easiest and cheapest is probably cooking or fletching. I like thieving though, since its easy and about 200k exp an hour(91+) in the pyramid when I get there some day, I get about 100k now. :D Gone from level 54-73 in 4 days.
Can you make bowstrings at level 44? If you are P2P anyway, that's a bit slow way of doing it, but good cash if you sell them afterwards. As for F2P...Collect/buy cowhides and make coifs.
I used werewolves in canafis pub from 50-55, or around there, then hellhounds/pest control to 70. Hellhounds are quite fun, level 3 clues. :thumbsup: Now I only range blue dragons because they are a great source of money.