hello, can anyone help me with autonumbering of fields

Why is that a problem?  ie what is the problem of saving and then seeing the Number?

The record id is even considering the deleted records and no starting from the start

If the current record If is at 500, and for some reason you want to start at 1, then you can have a formula of [Record ID#] - 500.

But going forward from now, you are correct that if you allow records to be deleted, then deleted records do use up a number.