If you have only installed “Tryton desktop client, PostgreSQL,Python, pip” on your system then you will also need to install the Tryton Server.
I suggest taking a look at Tryton components - What is needed for a functional system and How to install Tryton — Tryton server.
Then when you have all the components installed you should be able to create a configuration file for the server, and start the server with the command line option suggested in How I can connect tryton with with postgresql. Apart from that , I can't find configuration file of trytond - #12 by nicoe
Another alternative would be to try and get Tryton running using Docker: How to run Tryton using Docker - #10