This is my first time using this program, and I have created a character model (I know it's bad), but when I set up an armature for it and went into pose mode, the mesh would not move with the armature. I have tried troubleshooting online and I couldn't find anything so I was hoping some of you can help. 
https://www.dropbox.com/s/8rxnlrcao3tujap/person%20model%20rig%20test.blend?dl=0 This is to download my .blend file
This missing piece to your model is the process of weight painting, which I started here:
Your model -- at least the one you uploaded for me to look at -- does not have weighting that assigns each bone to the mesh: The bluer the mesh is for a particular bone, the LESS it is attached/attracted by the bone. The redder the mesh is, the MORE it follows the bone.
The subject of weight painting is one that is covered here and in other online tuts very well... but the summary answer to your question is "because your model is not weight painted...."
Some resources here: https://blender.stackexchange.com/search?q=weight+painting
and here might be another place to start: https://www.youtube.com/watch?v=S0VS0IVylzg
Please let me know if I missed the point of your question, though... I often do!
best rg
