For this example we'll use the following formula, which is designed to calculate Fantasy Points for a Fantasy League. This formula can be modified to match your league's scoring system:
(Player_Stats__regular_season_passing_touchdowns*4)+
(Player_Stats__regular_season_passing_interceptions*-1)+
(Player_Stats__regular_season_passing_yards/25)+
(Player_Stats__regular_season_rushing_touchdowns*6)+
(Player_Stats__regular_season_rushing_yards/10)+
(Player_Stats__regular_season_receptions*0.5)+
(Player_Stats__regular_season_receiving_yards/10)+
(Player_Stats__regular_season_receiving_touchdowns*6)+
((Player_Stats__regular_season_punt_return_touchdowns+
Player_Stats__regular_season_kick_return_touchdowns)*6)+
((Player_Stats__regular_season_two_point_conversion_pass_completions+
Player_Stats__regular_season_two_point_conversion_reception_succeeded+
Player_Stats__regular_season_two_point_conversion_rush_succeeded)*2)+
(Player_Stats__regular_season_fumbles_lost*-2)