First-time buyer in Noida, totally confused about next step

Since last Diwali I've been checking out flats in Noida, it's a headache yaar. Chamrawali Bodaki mein Sampada Group ka project dekha hai, under-construction hai. Builder ka delivery track record kaisa hai, any idea? Bohot darr lagta hai ki delay na ho jaaye. Site visit pe kya kya questions poochhne chahiye, especially for under-construction? Main first-time buyer hoon, honestly bohot confused hoon kya dekhoon.