To answer your question, if you are really adamant about playing RS3 i'd recommend joining a clan. Not a clan with 200+ members because those are absolute trash. Clans that are on the smaller/medium side usually want to grow so they are willing to dedicate more time towards their newer members. I stopped playing RS3 because of its' incredibly toxic and elitist attitude when you get towards high level PVM.
I recommend committing to osrs tbh. There is much more room to grow and it isn't plagued with MTX like RS3 is. There is a much more sense of achievement on os as well since it's not easyscape/dailyscape.
if somebody likes playing rs3 just lay down and accept it.
You can learn the game in no time, nothing is to complicated.
It's only complicated if you have expectations.
A tip would be to start fresh, start from scratch and do quests, quests give you more experience about to game and unlock most of the good benefits.
I don't play anymore but if you are starting from nothing (osrs) I would suggest grinding out med clues until you atleast get one ranger boot. That instant 30m will give you a great start, and it's free. All you have to do is kill some fally gaurds (best drop rate percentage) or other things. I would suggest using runewiki and youtube should you have any questions, don't hesitate to ask. Good luck on your grind.
Edit: still learning the forum, I see that this rs3 and for that I don't have any advice, sorry.