My biggest advice is to not fill it right away. It’s hard to anticipate every one of your needs until you start patching things together and go “hmm what I wish I had was…”.
Personally, I know some will disagree philosophically but adding a filter to my 0-Coast made an immense difference. I chose Ripples for my 0-Coast Pod sidecar because the VCA and simple 2-input mixer are handy. It sounds really nice with the Contour too - I ended up buying the Euro version that just stays patched into Ripples (multed to VCA & FM).