.5 PPR RB2 /WR2/ FLEX advice

In a 12 Team .5 PPR league
Need to decide how to fill RB2, WR2, and flex spot with following players:
Will Fuller V
Raheem Mostert
Ronald Jones
Danny Amendola
Geronimo Allison
Also can pick up MVS on waivers^

Lineup so far:
QB: Wilson
RB: Saquon Barkley
RB: ?
WR: Golden Tate
TE: Rob Gronkowski
Flex: ?
DP: Reshad Jones
DP: Chandler Jones
K: Adam Vinatieri