Answer
(Fatwa: 395/395/M=1431)
(1 & 2) Seeing the girl before marriage is optional not wajib or necessary. If the boy desires to see the girl whom he is going to marry, in this case he is allowed to see her face etc only once. And the better option is that the boy should send his reliable women relatives and satisfy himself through them.
(3) It is better not necessary.
(4) For this, sincere and firm tauba and instighfar is necessary, there is no need to disclose it.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband