Once you grow a beard, here are a few steps to help you maintain it.
Shampoo your beard daily.
Use conditioner on your beard to soften it.
Towel dry your beard and comb it, using a large tooth comb.
Once your beard is dry you can trim it. If you trim it while wet, you may trim off too much because wet hair is more relaxed than dry hair. Use sharp scissors and/or a beard trimmer. Trim a little at a time and keep the symmetry by trimming one side first then the other side.
Trim your moustache, using your lip as a template. The hair should not grow over your top lip. You can trim your moustache from the centre to each edge. Use a small tooth comb when grooming your moustache.