To create Fixed Asset Item List, from Main Menu > go to Lists > Fixed Asset Item List:

 

QB Fixed Asset Item List 1

 

If you need to create a new fixed asset item, click the Item drop-down menu > New.
If you need to edit, say existing Computer fixed asset, and click Item > Edit or double click the highlighted computer row:

 

QB Fixed Asset Item List 2

 

As you can see, you can put many information on the list - asset name, new/used, purchase date, cost, vendor, asset account, description, etc.
The Asset Account is the account you choose in your purchase transaction.

When it is time to sell your fixed asset, check mark the “Item is sold” box. This will allow you to enter information in the Sales Dates, Sales Price, & Sales Expense fields.