Puro puro is your place to be for bones, early ppots etc (get 89 hunter, it ain't too bad)
::barrows for gear,runes and secondaries - go for 15k points and buy a set of the middle guy.
Dare to ask people for advice, there's a lot of veterans who are always open to help. (can always pm when i'm online)
Do tears of guthix minigame for xp in your lowest skill.
Exchange long and curved bones for con xp at the house portal guy to skip the starting grind.
use ::2fa for bonus xp on your votebook.
Aways check the skill of the day or prepare for it, this will ease the pain.
A few revenant trips will get you some starting GP for runes, also slayer or any bosskilling will pay you in caskets.
Look out for advertised clans as they will glaldy help you with your questions.
Set goals so you don't get burned out easily.
Join Alora Discord for info, giveaways etc.
I could write a lot more, hope this gets you started. If you're ever in need I'm also fairly new so I wen't through the same process.