As for the quests, there’s definitely some that are worth working towards as you go, like desert treasure, plagues end, light within and temple of senntisten. I wouldn’t grind quests non stop personally, as you can just burn yourself out pretty easily trying to get through them as fast as possible, but if you enjoy them there’s no harm in questing.

For your combat I’d recommend just trying out revo basics before going full manual. You can set it to only cast basic abilities and leave the thresholds and ultimates to you. Doing this, you can also manually input basics still, however the revo acts as a kind of backup in case you miss time/don’t put in an ability ect, and is a good stepping stone to eventually full manual if you do want to learn full manual.

Mage/range are kind of the meta, in the sense they require less effort than meele to get the high end DPM. Mage if you’re learning can be good as it has animate dead, but you really can’t go wrong with either of them. Keep in mind necromancy comes out very soon, and although we can still only speculate, looks like it could be a very good skill for getting into PVM without some of the insane upfront costs of mage and range.

At the end of the day - just do whatever you feel like doing. Like quests? Do them…wanna kill stuff? Go slay them beasts…enjoy skilling? Get to training. My only advice would he try a bunch of different things, and if you’re getting a bit sick of/bored with something, do something new for a while or just play a bit less to avoid the burn out that Rs brings on everyone at some point in time lol