Do i create indexs on Search head or on each indexer on non cluster envioment

Hi, We have a indexer{2 indexers] in our environment, 2 fowarder and 1 search heads. If we create indexes on a search head using GUI will the configuration for these be reflected in indexers? Please advice detailed steps to create indexs in a simple splunk envioment with 1 Search head ,2 Fowarders and 2 Indexers . Regards smdasim