I’m still figuring out what sort of build I want to play at the moment. Dual flame totems is pretty popular right now. In the past I’ve enjoyed cyclone builds, as well as playing a crit ice shot. It’s up to you really if you want to experiment a bit (which can be really fun), but I would recommend at least making one that you know’s already viable. The lists in the forums are pretty good for finding ones/referencing them:
As you probably know by now, the builds are built around the skills and the classes just provide ideal starting positions on the tree for getting nodes. To have a viable build that can survive late game you have to focus on having health (or/and Energy Shield). As well as your evasion/armour and resistances - which you’ll get a lot from gear.
After quests and getting quest rewards, the vendor in towns (that sells flasks and jewellery) also sells SkillGems. There’s a list of them here.
pathofexile.gamepedia.com is your friend, and will provide loads of information on skills, quests, anything really.
Ziggy D’s Quick Start Guide is a really good place to get going too: Playlist here
As well as r/pathofexile’s new player guide: https://www.reddit.com/r/pathofexile/comments/1zn0lt/new_players_welcome_to_rpathofexile_please_see/
Then if you have any other questions hit me up on teamspeak or something, and there’s usually a few other people who can offer helpful info.
Add me in-game, name is Figurine