if you live in the U.S., suggest you check out colleges (including community
colleges) and universities in your state for online Access classes. for
instance, in California quite a number of schools offer a variety of online
software classes including Access. BUT, in my experience, most Access
classes of this sort teach you the basic mechanics of how to use the
software - with little or no instruction in relational design principles.
that's like teaching someone how to "use" a car, without also teaching the
rules of the road. recommend you also, or first, search for a class in
"relational design" or "data modeling". there are also a number of online
resources, and books, that you can use to learn data modeling on your own.
for more information, see
http://home.att.net/~california.db/tips.html, tips
1 and 2, in that order.
hth