Look no further. I have descended down from the mountains to share with you the sum of all of my wisdom.
Go solitus or trox. Roll an adventurer. It doesn't really matter if you go melee or ranged, you'll figure this out as you level. Over the entire time I have played AO, adventurer has been the most consistently good choice to play, it's easy to learn, and will allow you to solo well when you have trouble finding teams. The game will be all around less frustrating and more enjoyable to you as you learn it. Furthermore, if you level up and discover that adventurer doesn't fit your playstyle, you'll have a solid main with which to support a more difficult profession.
You're welcome!