Well, easy's relative.

Each team starts two different rosters, one college and one NFL.
The college starting roster consists of:

1 QB
4 RB/WR/TE (minimum of 1 RB and 1 WR)
1 K
1 Defense

The NFL roster consists of:

1 QB
4 RB/WR (minimum of 1 RB and 1 WR)
1 TE
1 K
1 Defense

The scoring is the same for both:

6 pts for a TD (rushing, receiving, kick/punt return)
4 pts for a passing TD
2 pts for a 2-point conversion (rushing, receiving or passing)
1 pt for each 10 yards rushing or receiving
1 pt for each 20 yards passing

2 pts for a field goal under 30 yards
3 pts for a field goal between 30 and 50 yards
4 pts for a field goal greater than 50 yards
1 pt for a XP

Defense:

2 pts for a turnover recovered (fumble rec., interception)
2 pts for a safety
1 pt for a sack
6 pts for a TD by interception return or fumble return
10 pts for a shutout
6 pts for holding an opponent's offense between 3 and 6 points
4 pts for holding an opponent's offense between 7 and 13 points
2 pts for holding an opponent's offense between 14 and 20 points

Each team will compete against another with both rosters.  Each roster is separate but equal.  Therefore, a team can emerge from a week with a sweep (both the college and NFL team won), a split (one or the other won), or being swept (neither won).  The college and NFL wins are combined so it's important to be strong in both.

Now, the schedule.  The meat of the college football season is from the week ending Sept. 4 to week ending Nov. 20.  Teams play before and after that but not enough to be fair.  Unfortunately, the NFL season doesn´t start until Sept. 12.  Therefore, the first week will be college only.  There is then 11 weeks where pro and college will be run the same week.  The college football season is then mostly over, so there will be 3 weeks of just NFL play.  Only 1 win or loss can be had on each of those weeks where either college or pro are playing alone.

The playoff makeup will depend on how many teams the league ends up with.  Assuming three playoff weeks, weeks 1 and 2 of the playoffs again will be played with NFL rosters only.    For the Championship game, both college and NFL rosters will be submitted.  The scoring will be a combination of the college rosters from the bowl games and Week 17's NFL roster.  This allows the college roster to help determine the championship and weaken the impact of Week 17 of the NFL season when some teams rest their best players.

Tell me the roster rules are easy.