At The Menu Where You Start The Game You get To Choose Your Player Choices:
1:Marty 1885
2:Marty 1985
3:Marty 2015
Then Choose Where You want To Start And you Can Spawn There
1:Hill Valley
Then You Go To Convert To Time Machine
There Will Be Missions (Only 4)
1:Late For School
2: Meet Doc At The airport
3:Getting Chased By Biff In 1955
4:Clock Tower
Those Are Some Ideas I Had For 0.3