2 tips here:
1) Don't touch your beard for at least 2 months, try for 3 months. That is the trick. Trust me on this. Not all, but MOST guys have spotty bald areas. If the rest grows normally, leave it totally alone for at the least 2 months and those spots WILL fill in. Also, if you are going for a big beard, one of the other reasons that you should not, can not, so much as touch it for 2 months, is because you will have little wild hairs that shoot off in different directions.
The natural inclination is to clip these few hairs, that is where you will fail to grow your big beard. You must accept the fact that your beard, your face, yourself, will look bad for a few months, you won't be as clean cut as you would like, but those few hairs that shoot off in another direction, not only do those few hairs here and there really add up over time if you clip them every day, but they also eventually lay back down properly as they grow longer.
The whole trick is can you make it for 2 months without ever touching, trimming anything no matter if its "just 2 hairs this morning" because like I said, you clip just a few every morning, that really adds up.
2) Don't be afraid to dye your beard. There is nothing wrong with Just For Men. If you use shampoo, if you clip your toenails, you groom yourself, touching up your beard to keep it groomed and looking bad ass is the same thing. My beard is medium to dark brown...except for my mustache which is blonde. As long as you pick the right color, it looks natural and just a lot cleaner, don't be ashamed to show some extra care and love to your beard, its super easy. You brush the stuff into your beard before you shower, let it sit for 5-8 minutes, then jump in the shower and wash it out. It will last for about a week and is very affordable. You get multiple uses out of 1 box.
Right now I just have a 5 o clock shadow but I often have a handlebar mustache and/or a really big full beard, when I do, I dye the few spots that don't match once a week on the weekends, takes 5 minutes.
Just my 2 cents. You can take that advice or not but all I'm saying is my beard and handlebar mustache are pretty awesome and I have no shame whatsoever using Just For Men, it's not like your using NAIR or Summers Eve.