Will taking a warm bath help your period to start?

No. Your period depends on hormones sending the message to your body. If you are waiting for your first period this won't happen until your reach puberty. If you have reached puberty and are just starting it is the same way. You may find that your period is not very regular for the first year and it may run from 3 to 10 days. This will settle down as soon as your body settles on a regular cycle.