I am planning to self host our docker swarm services and I don't know what is next

I am not a devops engineer and I am very new to hosting in general, we have a big system we want to build and we cannot afford cloud providers at this early stage, at least till we hit revenue. So we decided to self host the system using docker swarm on multiple servers behind Traefik reverse proxy.

I do not know what is next. Should there be a firewall? if yes, our knowledge is very limited in this field and we are sure cloudflare would have a solution to securing our cluster.

Basically i need to know what are the steps to do when self hosting and what cloudlfare services would be best to protect our cluster.

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