Hey welcome back,
If your looking to use a VPS I would suggest that you only need a static residential proxy for each of your Characters,
I personally would refrain from linking all my characters to one jagex account as in the future that could cause a decent amount of chain bans. Keep them separate,
To avoid detection dress, skill and play like a normal player, have a schedule where you would mix up skills rather then just suiciding one to 99.
And the scripts depend on your goal to be honest, but you could start with stealth Quester, an AIO Fighter from there you can look into skilling scripts, but like I said depends on your goal.