Now is a great time to come back, I believe PoF is still on sale, they have recently made living world episodes available for free for extended periods of time, and the season 4 finale drops this Tuesday. If you'd like to support a youtuber with your purchase I believe Woodenpotatoes and Jawgeous both have links on their channels to get you to the deal.
You can play any class in PvE and find there are strong builds for it, so play what you like! Metabattle and Snowcrows are good sites to give you build ideas
PoF is fantastic. The new elite specs are great, the story was a very enjoyable ride, I liked the maps a lot, you'll get a mount almost right away, and if you get it now you'll get access to living world episodes like I mentioned above. More bang for your buck if you jump in sooner rather than later.