how best to organise family apple ids with one master ID for procurement

Kovic,

Set up Family Sharing. Make yourself the Family Organizer. Enable "Ask to Buy" for each of the members. See documents below for more details.

Note that as the Family Organizer, all purchases will go against your credit card unless the member has a credit balance.

Family Sharing - Apple Support

Request and make purchases with Ask to Buy - Apple Support

as the organizer, will everyone else have access to your content?

bbgun69 wrote:

as the organizer, will everyone else have access to your content?

To your content purchased from the iTunes Store, yes, unless you Hide it.