How do you make transfers? Please
Quite easy actually Eric.
Choose your design(s) and first print them a few times to normal paper until you're staisfied with size, colour etc. If need be you can easily adapt those design with Photoshop, Coral Draw or similar program.
But decal paper suited for your printer ( Laserprinter or inkjet)
or
go to a copy shop and have it printed on the same paper for you.
If inkjet it wil probably need an extra coat of 'varnish' There are specialized products for this on the marker from Microscale and such.
Use as a normal decal. Nothing more really. Keep in mind you will probably not be able to print white so either you need a white background or have to print on white decall paper instead of clear