Depends how long you're trying to grow it out. Most men look good with "long stubble", or you can go for a more fuller beard, which might take a several weeks to a few months. Or you can just say fuck it and go all the way, like me.
(14 months btw)
The best advice I can give is to be patient, and it will itch at first.
Seriously, man, trim that mess. At least trim the pube looking hair on the sides. The hobo look is awful and no one should purposely go for it.