1) If it’s a professional, you call to set up a meeting.
2) A friend is probably better as far as finding a good match, and worse as far as helping the shidduch proceed to engagement.
3) It doesn’t sound as if your parents will. I highly recommend having a mature, discrete, seichel’dik “mentor” to discuss it with.
4) See Torah613Torah’s answer above.
5) Honesty is good, but at the same time, you do want to put your best foot forward. So, for example, if you smoke, you should say that at some point, but don’t smoke on a date.