Thanks for reaching out to us, Daniel.
I understand that you want access to the QuickBooks manual/guide to familarize with the processes. There isn't a way to access or download the QuickBooks manual. However, visit our Help Articles page to find topics and discussions to assist you with your QuickBooks tasks.
If you want to auto-calculate depreciation for fixed assets in QuickBooks Desktop Enterprise, you can use the Fixed Asset Manager (FAM) feature. This will automatically calculate depreciation based on the IRS standards. Check out the resources listed below for more information on setting up FAM and tracking fixed assets:
QuickBooks Desktop can help you with your accounting needs. If you have further questions or concerns, please let us know. We're always available to assist you.