Did not file all my 8606 forms

Unfortunately, I missed filling out 8606 form for a number of years that I made after tax contributions to my rollover IRA.  My understanding is that I can still fill them out now for the missing years and pay $50.  I do have 5498 forms and financial statements showing the contributions for most of the years.  Questions.  Do I need any other documentation for missing 8606 forms?  What do I do for the couple of years that I don't have documentation?  Can I go ahead with any rollovers or distributions without sending in the 8606 forms to the IRS and then complete them if they request them?  Thanks in advance.