Answer
(Fatwa: 1480/2008/D=1433)
After istikharah the heart automatically turns towards the better option or Almighty Allah creates betterment in what the man has adopted. Neither it is necessary to have a dream in it nor there is need to investigate positive or negative from anywhere. If after doing istikharah once the inclination is not clear or it was so from earlier time and it is not going to be clear whether it is good then it is better to do istikharah for seven days. After then one should start the work with advice.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband