If you want to play on PC you need to purchace PC version of the game (you can get boxed ones really cheap) and once you install it you can simply login to the same SE Service account as the one you're using on PS4 so all your characters and progress will be there - you'd need only to re-create your hotbars, gear sets and macros as those are stored localy and not server side. You'll also receive another 30 days of playtime.