Where are you going to get the supplies to pk?
Hell no one will even have a rune hatchet or pick axe for a very long time, let alone decent gear for pking. I have so many doubts for clans rushing to open at this time or anyone that thinks they're going to even Solo-Pk anytime soon.
Runecrafting, Mining, fishing, and Woodcutting are the most important things to do at the beginning, then you will be able to branch of from there into Smithing, Fletching and Cooking.
People are forgetting that Law Runes are going to be just as rare as any other item that takes alot of skill to make, so you're going to have to walk everywhere, which takes even more time. People are also forgetting that once someone is able to even make a rune item that they can't even sell it to anyone because no one will be able to buy. Back in Runescape classic, I remember some woman giving out her rune items for that reason.
It took years, hundreds of thousands of players, chinese gold farmers, and bots to create the economy of 07, and I feel if we do start with a clean slate, then everyone on this site is sadly mistaken on how things are going to go for this year alone.