@francisco_garcia the first step of adding a node is straight forward and the details on how to do so can be found in our documentation Installing Qlik Sense in a multi-node site (This includes all the steps, some of which you have already done by having a single node setup already up and running)
Regarding setting up the dev node, that too should not be much of a struggle, the following article describes Node Purposes and is worth reviewing for the context of this concern. Qlik Sense - Clarification on Node Purpose
Regarding setting up a reload node and shunting dev work to a specific node, you'll want to read up on the various Load Balancing options. Shunting dev traffic to a dev node can be done by setting up a new virtual proxy while moving reloads to RIM nodes and excluding the Central node will require a custom load balancing rule.
NOTE: Load balancing rules won't be able to exclude some specific tasks from being loaded in the Central Node. Because there is an immutable load-balancing role that says all resources are available on the central node. This is working as designed.
Lastly, once you get into writing custom rules I always like to link Collection of Specific Rule Scenarios and Customization of Qlik Sense Security rules, it primarily relates to custom security rules but provides information and links to a number of useful resources I advise reviewing and skimming through.
I know this was a lot but should provide you with the info you need to get started planning.
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