Whether GST is applicable on sale of tender and if applicable what is rate and HSN code

DEAR ALL, I PURCHASE NEW FLAT IN AHMEDABAD FROM BUILDER, FLAT IS READY TO MOVE, SO WHAT IS GST RATE APPLICABLE?, I JUST PAY DOWN PAYMENT FOR THIS, DEED IS NOT READY, SO WHAT NEEDS TO BE KEPT IN MIND? HOW CAN I SAVE GST ? WHICH QUESTIONS ARE I CAN ASK TO BUILDER?

Seetharaman Sir,
I am a sebi registered sub-broker in the share market. I have registered for GST. I understand that if the turnover is more than Rs. 2 crore, one has to get the books audited for GST . For a sub-broker, how to calculate the turnover?
1) I am only earning brokerage from my main broker, for the transactions I do on behalf of my clients.
2) For me, as a sub-broker, is my brokerage my turnover?
3) If not, is the vale of the transaction carried out on behalf of the client, my turnover?
Kindly guide me.

can we avail credit on purchase of artifical flower bouquet.

What is meant by composition scheme in GST?

A proprietorship company already registered & started work in construction of residential complex service (SAC: 9954) , now company started renting of land. Is it require to get a new registration under renting & leasing service (HSN:9972) before issuing Tax Invoice , making payment & submission of return? please advice.

Sir, We were under Regular scheme in GST from July 2017 to Nov 2017 and then, switched over to Composition schime from Dec 2017 to Jun 2018. We closed our business by the end of Jun 2018 and applied for cancellation of RC in July 2018 and finally got the Order of cancellation of GST registraion in Nov 2018 from GSTN.
Now, should I file GST annual return or Not ?
If so, whether form GSTR 9 and 9a ( Regular and composition respectively ) or GSTR form 10.

Kindly advice.

1.what type of gst registration should be taken for cinema production (proprietoryship)?
2.what option to be selected under "Nature of Business Activity being carried out at above mentioned premises"?

1.what type of gst registration should be taken for cinema production (proprietoryship)?
2.what option to be selected under "Nature of Business Activity being carried out at above mentioned premises"?

Dear Experts,
Pls let me know the meaning of retail sale price whether it is refer to MRP or sale by retailer.....

Thanks
ASAP