I myself would start up a Beastlord (and I have). They are very fun to play, somewhat due to the fact that they are pretty much balanced, unlike a great many other classes (under and over). They provide an excellent set of utilities (melee, slow, haste, pet, stat buffs, regen, mana regen, sow, heals, efficient hybrid 1:3 ratio direct damage spells, dots, etc.). They are not entirely reliable on getting groups, but they will be gladdly welcome in most groups when they want to get one. They are good soloers and can do so all the way up to 65.
I would say that you could quickly level a beastlord up to 40 if you know where to hunt and have some help at it. Most fun class I have played in my 3.5 year period playing EverQuest.
A man said to the universe: "Sir, I exist!"
"However," replied the universe, "That fact
has not created in me A sense of obligation."
-- Stephen Crane