Anything like that is collectible. Especially the ones signed by players. I assume you mean European style football and not American football. Regardless if you are in the UK, sell in the UK, especially since it has UK provenance.
You can do a comparison (comp) by doing an Ebay search using a lot of key words for this item, or doing a Google search also to find market comps. Then you just have to list it on Ebay in the correct category with a full description title and description.
I would not sell as one lot, since someone would be looking for the bulk/deal price for all.