In order to accept payments, you need to set up the merchant backend. To do this, you first need to register a bank account with us.
Then, go git clone https://github.com/Windfisch/taler-podman and read the merchant setup howto.
Note that the merchant backend must run on a publicly accessibly HTTPS server. If you don't own a domain, ask Windfisch about subdomain.tschunk.shop.