How can I start using virtuemart? I'm with prestashop that I start with?
uno online (https://uno-online.io)
You can download & install free starter packages with sample product data to see how VM works.
The downloads are on https://virtuemart.net/downloads
These are direct links:
https://dev.virtuemart.net/attachments/download/1364/VirtueMart4.0.20_Joomla_3.10.11-Stable-Full_Package.zip is a Joomla/VM package, ideal for beginners.
https://virtuemart.net/releases/com_virtuemart.4.2.0.10905_package_or_extract.zip ready for installation on J3 or J4.