Make a possession receiver and start him on the Bears. This will make you start as a #2 receiver and have an 82 overall. I made my receiver 6'8 but you can prob make him 7'0 to make him truly unstoppable.
NOTE- Turn of fire coach option, if you coach is fired, your stats drop dramatically.
Each season play 4-5 games and run up the stats as high as possible. Lead the league each year receiving yards, tds, and catches. You may sim to the end but make sure you save around week 14 and see if you get the end of season rewards that you want to build your legacy.
You should get
OROY - Rookie of the year (first year only)
Offensive player of the year
MVP of the league
many other milestones
If you don't get the milestones above, reload your save and play more games to boost stats.
After you get the following rewards, sim your way game to game and win the superbowl, saving after each playoff game and reloading if you don't win.