My advice is take your time, enjoy the game. Couple tips. Main quest line is both enjoyable to play and great for leveling, no rush on it but don’t leave them behind. Don’t level up too much too soon from dungeons and stuff, the world will be at your level. So if you get to like Lv40 by act 2, the world will be at your level, and it’ll feel really bland, no sense of progression. Pick up all the side quests, but no need to do them right away. They’ll stay on map and you can do it when you run into it or feel like doing it. Feels better that way.

There are 5 acts in total, try to pace your progress so that you can reach level 50 at around the end of act 5. The the main story line is over, 50 is the entry level of tier iii difficulty, the endgame starts then. Endgame is the real game. Main story line is half of the content, and endgame is the other half!

Enjoy