Many of your questions can be answered in our docs and we even have videos to help you understand how to both use LabKey and understand the functionality:
If you want to create a webpart and only list the queries that you created, creating a new schema (even a Linked Schema) isn't really necessary since you can setup individual webparts for those queries or you can setup a wiki and have all those query web parts be displayed in the wiki or just create hyperlinks for those queries in the wiki as explained in my response to you on your other forum post: