Hi @Itzloi,
are you speaking of both Search Heads and Indexers Clusters or only one?
Did you already make a Capacity Plan of your needs?
Did you designed an architecture for your infrastructure? (for your info see at https://www.splunk.com/pdfs/technical-briefs/splunk-validated-architectures-it.pdf)
if you already did these preliminary steps, you can see at:
https://docs.splunk.com/Documentation/Splunk/8.1.3/DistSearch/AboutSHC
https://docs.splunk.com/Documentation/Splunk/8.1.3/Indexer/Aboutclusters
for configuration steps
Ciao.
Giuseppe