Can i add more than one ip address in the IP Service List (/IP Services)?
I would like to give Winbox access to 192.168.0.0/24 and the public ip of the company where i work.

Or do i have to set winbox access to 0.0.0.0/0 and then set the access rules in firewall?

Use /ip firewall filter rules to add multiple IP addresses, that will be allowed to access the router.