Force Points can be used for Force Powers (like Lightsaber Assault or Force Lightning, etc), but also to do either 1 of these things:
--Reroll an attack or save roll. It's often referred to as a "fprr" (Force Point re-roll).
--Move 2 extra squares as part of the character's movement. Some Force Powers allow you to move further with a Force Point (ie, Knight Speed allows you to move +4 squares, and Master Speed allows you to move +6 squares...there is no Ludicrous Speed yet, but perhaps it's coming
)
So characters with 1 Force Point can choose to spend that FP to reroll or move faster.
However, it's worth remembering that those characters are still considered Force Users, which means that they take more damage from special abilities like Jedi Hunter (+4 attack and +10 damage vs Force Users) and Jedi Hatred (+10 dmg vs Force Users).