Team Analysis
Overall Reaction

Roster
Outlook
This is an inferior team that almost certainly won't make the playoffs as is, unless you get some unexpected performances from multiple players. Therefore, you should look to make some trades ASAP and you should also be very active on your league's waiver wire.
Playoff Chances
Prediction
QB Analysis

Josh Allen is a strong QB1 for a 12-team league. He should consistently produce high-scoring weeks as your top quarterback.
RB Analysis

Christian McCaffrey is an average RB1 for a 12-team league. Not bad by any means, just not as good as some others. He may help you win you some weeks, but might also have some less-than-stellar performances here and there.
For a 12-team league, Joe Mixon is a pretty good RB2. Barring something unexpected, he should produce well in this role.
WR Analysis

Adam Thielen is a really bad WR1 for a 12-team league. Make it a priority to try and upgrade here.
Christian Watson as your WR2 in a 12-team league is just terrible. Pursue all possible ways to upgrade this spot.
TE Analysis

Kyle Pitts is a pretty weak TE1 for a 12-team league. May show up a few times over the course of a season, but otherwise will likely let you down.
FLEX Analysis

Roschon Johnson is a rough FLEX1 for a 12-team league. There will be numerous weeks where he'll make you regret not upgrading.
Compare vs. Average
PK Analysis
Justin Tucker is an average kicker.
In general, don't spend much time worrying about kickers. They are too unpredictable. Try to find a kicker on a team with a good offense. And if he's playing in a dome, even better.
DEF Analysis
The Buffalo Bills are a solid defense. They should be startable most weeks, depending on the matchup, of course.