Manchester United memorabilia, plus Beckham Boots

I have acquired a collection of Manchester United memorabilia including Mat Busby personalised xmas card A set team personalised " " David Beckham's boots signed with news paper clip (him wearing boots) & photo with Manchester youth team photo (showing boots again.. Paper weight with Man U turf within. Umteen magazines, vidios, admission tickets, .membership cards etc. This was collected by a Coach at Manchester and his father was the Secretary. Please advise how this can be sold for the widowed wife, thank you so much for your attention. I am living Tipperary Southern Ireland Thank again Billy Joe.