Hey Snake,
Nice idea, but make sure you look into everything you will be facing.
I'm from the States and starting my own hobby shop. Most
distributors/wholesalers here require a business license, store front
(some even want pictures), minimum first order, credit card info,
etc... Then there's setting up accounts with who you want to ship with,
example FedEx, now they require credit card and business info.
Then the dealer cost isn't all that great (discount off of MSRP retail)
unless you order large (high dollar amount) orders at a time. Some
online competition are actually distributors so they can offer items
much lower than we, as a retail hobby shop can.
Don't forget if you are going to sell online and except credit cards,
now you need a business bank account, a merchant account, gateway,
shopping cart, and of course a reliable hosting service, etc... All of
which gets a piece of the profit for processing "each" credit card
order besides their monthly charge.
My quess, you would have to set some sort of minimum order. It simply
wouldn't be worth it to sell a bunch of $2.99 decal sheets if you know
what I mean.
Do some research and homework before making any investments.
Good luck and hope things work out for you!