Create schedule with only start date and duration

Hi, i want to ask somethink,
i have tasks, resources those related tasks and durations of tasks,
for example,
Resource A,
Taks 1 : StartDate => Now(); - Duration 3 Days,
Task 2 : Starts with end of Task1 end date and Durtion 4 Days,
Task 3 : Starts with end of Task 2 end date and Duration 4 Days,

Can i use only this options and crate a schedule? is it possible?
Thanks