block unwanted emails
How do I block emails with nothing there to block them no unsubscribe or block
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Please provide more information.
Emails from unknown sources dozens every day how do I stop them
Well you leave us guessing as we really only know what you tell us.
Have you marked then as spam/junk in Thunderbird? You could use a filter I guess. See https://support.mozilla.org/en-US/kb/organize-your-messages-using-filters
As @matt indicates, filters can do a major part of the work. You might also investigate using Thunderbird's junk settings. Info at https://support.mozilla.org/en-US/kb/thunderbird-and-junk-spam-messages