Since you're starting with the latest Zencart version, and haven't added any mods yet, it's pretty simple. From the readme.html file:
Create a new database table and a new configuration switch by running the 'stock_attribute.sql' via Admin->Tools->Install SQL Patches. If you prefer to use another method to create this table, you will need to edit the file if you use a prefix such as "zen_" for your tables.
Open the stock_attribute.sql file in your text editor. Use the 'select all' function to highlight all the text, then Copy it to the clipboard. Then go to Admin - Tools - Install SQL Patches, and Paste the text into the large box, and click on Send.
Prepare the package for upload to your server by renaming the following folders to match your template name: includes/modules/YOUR_TEMPLATE and includes/templates/YOUR_TEMPLATE.
Find the two folders mentioned in the mod's folders and rename them to the name of your custom template. If you haven't created your custom template yet, do that first - there are a couple of tutorials that describe the process. It's simple.
If you are installing onto a new install or upgrade of Zen Cart 1.3.5 or later then with most good FTP programs (such as FileZilla) you can simply drag and drop the admin and includes directories into the root directory of your site. The files are already arranged in their directory structure.
Rename the 'admin' folder in the mod to the name of your admin folder name. Using your FTP program, drag and drop that folder and the 'includes' folder from the mod to the root (top) directory of your store.
This process will be pretty much the same for most mods you might want to install in the future, so it would be good to learn how now, rather than having someone do it for you, I think.