Please provide exporters or documentation for aws services

HI Team
I plan to Monitor AWS services like RDS, ELB using prometheus. so please provide documentation for step by step

Metrics for ELBs are only available via Cloudwatch metrics, so you will need to install the Cloudwatch exporter (or YACE). You can get some RDS metrics from Cloudwatch, but depending on the database type you may be better off using the correct database exporter (e.g. MySQL exporter).