Noida Extension first home: What did you miss?

Budget finalised, loan pre-approved – now stuck on which sector. Noida Extension mein Rising Group ke projects dekh raha hoon, especially Sector 63 A. Property price ke alawa aur kya kharcha aata hai? Stamp duty, registration, interiors – iska total kitna budget rakhna chahiye? Site visit pe kya specific cheezein check karun? Bohot confused hoon.