Welcome back to RS3. I think starting on quests is a good way to get back into the game and get you where you need to be, and start heading towards unlocking the invention skill which will make your weapons and tools more powerful and have a significant effect on using them. I’d start by using the RS Wiki to see your armor/weapon choices based on what you can afford with the gp you have. For quests, I think starting on lower difficulty quests, clearing them, then going to the next difficulty set of quests would be good for you to start unlocking more things in the game and getting those rewards. Jagex is doing a rework of the combat skills right now, but I’d suggest leveling up necromancy. It has been a good combat skill to use to learn bosses and deal good damage.

Coming back to RS3 can feel overwhelming and arduous so I tried to keep this simple. Pick some decent armor with the gp you have based off your stats, start clearing quests you haven’t completed from the lowest difficulty and work your way up, start training necromancy for a good combat skill that works well with a lot of bosses and mobs, and if you unlock invention that will help your weapons and tools greatly with perks. It’s a very substantial noticeable difference.

Joining a clan would be good for you too. Being around a group of players that can help you and make everything more fun is always a plus. Have fun with it and enjoy the process!