When I have a toon at/within this level range, I tend to go to the earth-kin camp Lehma-Koti in the Ram Duath, then onto Aughaire. The vast majority of the quests here are solo, with a couple of fellowship quests given by the earth-kin which can be missed out if you wish.
Then I head to the Misty Mountains and do as many Gloin's camp quests whilst gathering legendary book pages.
At around level 45, I go to Forochel (Gloin gives you a quest to go there if I recall correctly) which will last you until near enough level 50. Again, pretty much all of the quests here are solo. After that, you can head to Eregion and onwards to Moria.
All in all, I tend to follow the epic storyline, and use it as a guide on which area to go to next.
Main - Nimthriel 85 RK
Others || Ellethwyn Darkarrow 85 HNT | Gwyawyn Lionheart 56 CPT | Eadraen 10 LM | Raedwen 10 GRD | Rosilee 10 MINS