armature in blender help?

im having problems with the armature.

when ever i move one piece in pose mode, it moves the whole line attached to it, and it isn't sticking to the mesh, so it doesn't move the model body at all.

im trying to create a game character and i need it to move, like climb up walls, fight, stuff like that. ill later put in unity.

do you have any suggestions on what im doing wrong?? its been to long for me to remember what i did, sorry.