Hi Karthik,
Yaas/HCP are more related to hybris commerce related products. For example, hybris loyalty is completely based on Yaas platform.
SAP hybris Marketing(yMKT) is a NetWeaver/HANA based product so it follows more traditional SAP architecture. As far as AWS is concerned for yMKT, the vitural harware is provided by AWS and you could install yMKT on it. SAP admin/BASIS skill is needed to do this installation and without prior experience it will be not an easy task. Please look into getting someone with SAP admin/BASIS experience so that they can set it up for you.
Thanks
-Bharath