Heyho, thanks for opening this thread.
Simply said, you cant give your VTC-Members a Truck, they need to use their own one's and paint them for example in the VTC colours.
Since you freshly started with TMP and VTCs, here are some quite helpfull links and tools you could use for your VTC:
Trucksbook: (a virtual Dispatch-System to track you VTCs jobs) https://trucksbook.eu/
some links to the Knowledge Base, with the Topic VTCs (you should take a look there):
VTCs-Rules: https://truckersmp.com/knowledge-base/article/326
How to get validated: https://truckersmp.com/knowledge-base/article/325
Text-Editing Guide: https://truckersmp.com/knowledge-base/article/443
The recruitment-system: https://truckersmp.com/knowledge-base/article/1107
Roles: https://truckersmp.com/knowledge-base/article/1108
And my last tip, start with a Discord as communication-plattform: https://discord.com/
I hope you find some usefull tips in there, and wish you good luck with your VTC!
With greetings,
SebastianZ