Is there a particular Template you were wanting to try.

Just click the link and it should just download. There are also links to some of the templates on the course pages.

All will allow data entry.
If it's an ".accdb" file you can edit the tables, add fields etc
If it's an ".accde" then just data entry.

That all depends on the template. They're all different. Check the specific page for each template for instructions and details. Some are free. Some are for sale. Some have video instructions, while others do not. Some have an associated Seminar that go with them. For example, the Mailing Labels Template can be purchased by itself for one price if you just want to use the template and don't need the instructional videos (Seminar) that go with it. A lot of the paid templates have free "sample" databases you can download to test them and enter data, but since they're ACCDE files you can't modify the design unless you purchase them. So, the short answer to your question is: it depends. :)