Typical positions

A typical setup: (keep in mind there is a great deal of flexibility in postions and number of wide receivers vs. running backs, and even more flexiblity with the defensive package)
          Offense       Defense
                    |
                  WR| CB
                    |
                TE  |     RLB
                  LT| RE               SS
                  LG|
        TB FB QB   C| NT  MLB
                  RG|  T               FS
                  RT| LE
                    |     LLB
                    |
                  WR| CB
                    |
        
                    ^
                    |
             Line of scrimmage
           (where ball is placed)
Key:

On fourth down it is often advisible to punt. Here are the positions on a punt (special teams: punt and punt return units)

          Offense       Defense (punt return)
                    |
                    |      
                 WO |
                    | DL          
                  LT| DL  
               FB LG| DL  B
        P          C| DL                    PR
           FB  FB RG| DL  B              
                  RT| DL    
                    | DL     
                 WO | DL
                    |    

                    ^
                    |
              Line of scrimmage
Key as above plus:

Also part of the special teams are the field goal/point after touchdown (PAT) units:

          Kicking       Blocking
                    |
                    |      
                 WO | DL
                  LE| DL          
                  LT| DL  
                  LG| DL   
        K          C| DL    DS
           QB     RG| DL                 
                  RT| DL    
                  RE| DL     
                 WO | DL
                    | DL 

                    ^
                    |
              Line of scrimmage
Key as above plus:

Hope this helps. Enjoy the bowl games and Happy New Year.