I have no experience of growing in "Tropical Areas"

But this is what we would do in the UK;

Quote; Please let me know Tropical Acid soil Potted ornamental plants list.

Check with your nearest garden centre and buy a compost marked as " Ericaceous compost"

Quote; Please also let me know how to prepare Acid soil in nursery Soil.

Read this article and it might help!

http://www.thegardenersalmanac.co.uk/Data/Soil-pH/Soil%20-%20pH.htm