It's mostly in the docs: https://docs.splunk.com/Documentation/Forwarder/8.2.5/Forwarder/Installtheuniversalforwardersoftware and maybe https://docs.splunk.com/Documentation/Forwarder/8.2.5/Forwarder/Configuretheuniversalforwarder As to logrotate - that's all outside of Splunk. Basic Linux maintenance on log files. Any internet search engine is your friend here and all will lead to results that are useful. Best search may be though to get some "Splunk specific" search results, using a search like "splunk syslog" and read through a few of those best practices that will come up.
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