Creating site automatically with Powershell script in SharePoint 2013

I have SharePoint 2013. I would like poweshell or something else to read SQL Server table or SharePoint list and create automatically SharePoint site based on certain site template and give site permission rights. Is this possible?

1) What tool handles time schedule and call the script, let say every second hour?

2) Powershell script can read SQL Server data or SharePoint list to get name of the site and user names? If not what tool is suitable?

3) Poweshell script can give owner and membership permissions to certail users? If not what tool is suitable?

Kenny_I