Level up solo also can be quite fast now that you have Loot 2.0. Once get socket head gear you can add red gem to boost exp.

When I play new characters, I'll use as much EXP boost equipment as I can. Reaches level 60 really fast, once you hit 60 is where the nice armor drops and you'll level even faster.

If you're new and couldn't be bothered with the game then you could always look for veterans to help.

Getting friend's char from 60 to 70 takes about than an hour if I'm not mistaken, as long as they're clever enough to stay away from danger on T6.

I'm just not sure if you'll get RIFT / Torment before you reach level 60, if I'm not mistaken you'll have to at least have 1 character reach 60 before stuff gets unlocked.

Oh and to start D3 now is WAY better than starting it back in 2012 where it sucks big time.