Getting started with caching

I'm attempting to add some caching to my site. I've never done this before, and I'm confused by the books I've read and all the options that are available. Here's what I've done so far.
I have run aspnet_regsql.exe with the -ed option to enable the database for SQL cache dependency, and I've run it with the -et option on several tables in this database.
I've added the following lines to my web.config file:

        <caching>
            <sqlCacheDependency enabled="true">
                <databases>
                    <add name="WebSiteProductsDB22" connectionStringName="BTPProductsConnStr"
            &nbs ...