Whew! So much to say, so little to go on. First...you need an architect. Hire one. Then you need an engineer. Hire one of them too. Hiring a contractor to consult on cost and practical issues is a good thing too. Once your team is assembled, listen...hard! Best of luck!

I want to. construct a swimming pool. there.how to design the pool in order to make. comfortable for us and what is the cost.is it expensive or normal

Around 5 lakhs for average size 10'x20', 6' depth inground. Obviously it can only go higher if you need jets, underwater lighting etc Maintaining a pool takes away all the fun of enjoying it. Unless of course if you have maintenance staff. The terrace first needs to be designed to support the weight of the pool. If it is, and a sunken area has been created for the pool, then it would still work out close to the inground pool cost as we will need to ferry materials up. If budget is a constraint you can go for a white cement render Plunge pool instead like one below. It is also far easier to maintain than a full scale swimming pool.

@ Divya Sreedar. You will have to contact all of the ceramic boutiques that deal with imported tiles in Chennai. Attached below is a photo from AMSET ONE store in trivandrum with the subway tiles on display as I have seen. It takes 3 weeks to arrive from order date. If you like us to deal with the purchase please contact us or you could call them directly to find out.