HI Gaurav,
1) What value should be for Interval for Call Objects.
You can keep it as blank. Generaly if you want to run jobs on daily basis then you can keep interval as 1 & unit as D.
2) Rescheduling Include & Immediate start for call should be tick or not.Are these fields mandatory for batch job?
Check the check box for immediate start for call.
3) Also the scheduling period for a maintenance plan is 1 yr, then after one yr I need to create a new plan for the same equipment or I need to change the scheduling period.
You need to change scheduling period and restart the plan.
Regards,
Amol