One of the annoying things about having different "ranks" of members is that it's impossible for one rank to easily know what another rank can or cannot do. I realize you're just a "newcomer," but it MIGHT be possible for you to create database entries. Granted, you would only be able to do so for a magazine category that already exists, but if that's the case, all you need is for the category to be created and then you could create the entries yourself, which would be best since you're the only one with the info on the mags in the first place.
If you CAN'T currently add issues to an already existing database, then possibly that's an ability that only becomes available to people with "team member" status. If so, no problem. Once you scan/edit a single mag approved for uploading, you'll get bumped up to team member, at which point you'll definitely be able to create database entries (though again, either a database moderator or a...whatever the heck those guys with the red names are called... will have to create the magazine category first, so you'll have to ask one of them to do that, along with a download category for your completed scan. Luckily, all they'll need to do that is the magazine's country and title. The rest you would be able to do yourself once you're a team member. (Or possibly you could get someone to do it for you, but you'd need to give them all the info you have on the various fields on the database entry form, and then sit back and hope they find the time to actually do it. I always figure, if I've got to type out all that info to send to someone anyway, I may as well just input it myself. )
Congrats on the "lucky steal" A3 scanner, btw. I personally think it's FAR better to have an additional person out there scanning their own mags than to have them donate their mags to someone who likely already has an enormous pile of mags waiting to be scanned (I know I do). Although maybe someday people will have to start sending YOU donations of oversized British mags that can't be scanned with a regular A4 scanner.