There's no set guideline, this is generally what I do when I make a new deployment:
First of all, host groups should be put on the OneAgents, either during or after deployment. This will make the tagging of hosts, processes and services much easier.
Once RUM data is coming through, configure your application detection rules, and enable additional technologies such as JQuery, Icefaces, etc. This needs to be done early to start the 7 day baseline timeframe started asap.
Service and process group detection and then renaming of entities such as services, processes, user actions, should be done as early as possible to avoid re-configuration when these change, and to avoid changing the baseline. You might want to begin thinking about maintenance zones around this point.
Next I would look for any additional monitoring of technologies that could be enabled, e.g. IBM MQ plugins or Redis deep monitoring, etc.
Then I would decide how you're going to split the data with tagging, and then create management zones off of these tags.
Then look at additional data to be captured through request attributes, user action/session properties, conversion goals, key user actions, key requests, user tags, masking, etc.
Then you can look at enabling additional features, such as synthetics, log monitoring, etc.
