(CNN) -- Early this year, Michael Sam made news by announcing he is gay. On Saturday, he made history as the first openly gay player to be drafted by a National Football League team. Seconds later, he made waves kissing his boyfriend in celebration as cameras looked on. 

Now, Sam has one goal in mind -- to make the St. Louis Rams' roster. 

"I'm determined to be great," he told reporters Tuesday in St. Louis. "So I'm going to train hard and try to make the team." 

As a selection in the seventh and last round in the NFL draft, Sam playing for the Rams or any other NFL team this upcoming season is hardly a lock. 

And with standouts like Chris Long and Kendall Langford, the fact that St. Louis boasts one of the league's best defensive lines -- the place where Sam starred at the University of Missouri -- makes his task even harder. 

That challenge isn't lost on Sam, who some experts thought might not fit in the NFL not because of his sexual orientation but because they characterized him as a "tweener" -- too small to play on the defensive line, too slow to be a linebacker. 

Still, he sees the chance to learn from his Rams coaches and teammates things that can help improve his game. And he seemed careful Tuesday not to get too far ahead of himself, expressing thanks for being given "the opportunity to play" but professing no certainty that he will be on the sidelines come opening day. 
Who announced that he is gay?
When he did that?
Was he drafted by a NFL team?
Did he make a history of some sorts?
What?
What is his goal now?
Does he want to be great?
Whom did he tell that?
When?
What he is going to do to achieve that?
How is Ram's defensive lines?
Who are their standout players?
Will all these will be easy for Sam?
What some characterized him as?
Is he fast enough?
Is he a big guy?
Do the experts think his sexual orientation matters?
From whom he can still learn?
Is he careful about his acts?
Did he thank everyone?
Michael Sam
Michael Sam made news by announcing he is gay.
Early this year
 Early this year, Michael Sam made news 
yes
On Saturday, he made history as the first openly gay player to be drafted by a National Football League team
yes
 he made history as the first openly gay player
the first openly gay player to be drafted
On Saturday, he made history as the first openly gay player to be drafted by a National Football League team
make the Rams' roster
Sam has one goal in mind -- to make the St. Louis Rams' roster
yes
I'm determined to be great
reporters
I'm determined to be great," he told reporters 
Tuesday
I'm determined to be great," he told reporters Tuesday 
train hard
o I'm going to train hard and try to make the team." 
one of the best
St. Louis boasts one of the league's best defensive lines
Chris Long and Kendall Langford
standouts like Chris Long and Kendall Langford
no
 makes his task even harder. 
tweener
they characterized him as a "tweener
not as a linebacker
 too slow to be a linebacker
no
too small to play on the defensive line
no
some experts thought might not fit in the NFL not because of his sexual orientation
Rams coaches and teammates
the chance to learn from his Rams coaches and teammates
yes
he seemed careful Tuesday
yes
expressing thanks for being given "the opportunity to play"