Hi Ritu,
Too many questions.....
But...
1. Yes, you will need to install ADOBE Lifecycle Designer for ADOBE Forms only then it will work it will be there in the CD or you can download it.
2. ECC 6.0 is Netweaver only..... your Web Dynpro will work there are some setting for FQDN in SAP and hosts file in Windows for Web Dynpro to work.
For Hana you can learn but you will need access which I doubt is possible that easy.
Regards