SAP Installation in HA enviroment

Please help in following regards.

I want to migrate a SAP ECC 6.0 (ABAP) system that works in Standalone mode to a High-Availability System (HA) with two nodes working together... this standalone system is installed on Linux 5.5X64 with Oracle 10.2.0.5 and we have other machine/server (with the same operation system) prepared to receive the other node!

This is a migration project? What is necessary to do this...?!

Please guide me which method I have to follow and how?