How do I use whole fresh tamarind?
1- Remove the hard shell,

2- simmer them in a little liquid until the meat can be easily removed from the seeds.

Tamarind is very sweet and very sour. Tamarind chutneys are delicious for a starting point. You can find recipes but not many other ingredients are required.

You asked if you have to make it into a paste- I suppose not but cooking them is required to get the seeds out and cooking turns the meat into a paste.

Carmi is correct that you can add them directly to liquid but you need to be able to get the large, hard seeds out.