To make Puri(Golgappa):
Mix Semolina ,flour ,salt,soda b carbonate and 2 tspn of oil and knead it with the help of water .It should be bit siff.
cover it with wet cloth and let it stand for 15to 20 minutes.
Now make small balls and roll it into small circles about 1" diameter.
Keep the puris under the wet cloth as soon as you roll them.
Heat oil in deep dish pan or kadhai.
Now fry them such as it gets puffy and are golden brown in colour.
Keep them in kicthen paper towel so as to get rid of extra oil.
After it cool down completely ,you can store them in a airtight container.

For making pani:
Method1:
Mix all the ingredients together and store it .you can make it ahead of time and keep it in refrigerater.

Method 2:
Grind mint ,coriander,ginger and green chilies into paste.
Add water to the tamarind pulp .
Add the grinded paste ,salt,jeera powder and black salt to the water.dilute and add more water as you want.

Stuffing:
Mix all the ingredients together.

Tamarind chutney:
Add tamarind pulp ,jaggery ,chili powder,jeera powder ,black pepper and salt together.
heat the mixture in the pan for 5 to 10 minutes in medium heat.
Let it cool .

To Serve:
Do I have to tell you ?........:) common...
Poke hole in puri.
Add about 1/2 tspn of stuffing in the puri
Add 1/2 tspn tamrind chutney.
Dip the filled puri in the chilled pan and serve.

TIP:
Making puri is very tedious job,you can buy the readymade puri ,which you can get in any indian stores.
Same way you get pani puri masala.which you can use to make pani.
For stuffing you can use anything you like ,some people like to use only potatoes,some use boiled chickpeas,some like using namkeen boondi or sprouted moong .
Some people like hot so they avoid tamarind chutney.
So at last yoy have to decide your combination .Enjoy.