If you search a bit about farming you'll find a bunch of threads on here, and if you check gwpvx.com you'll find a separate section for solo farming builds.
A popular and easy one is the vaettir farm (assassin).
I sometimes use a 55 necro (originally 55 monk) for nostalgia sake.
SoS rits can farm pretty much anything.
If your goal is making money, you might want to dabble into speedclears as well.
The more heroes and/or henchman you have, the less you'll get in terms of cash, because goldcoins that are picked up are distributed among all the partymembers. However, they lootscaling should theoretically negate that (you'll get more money/common item drops if you're with more people). Search the wiki to see what items are not affected by lootscaling (like gold items and rare crafting materials).
Hope this helps a bit and good luck to you
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