1) Yes , you can club all three cases in the family court and that will too fast in decision than any another court. however kindly check in your are family court exists.
2) from 6 months to 1 years to get order , better to go for session court don't jump directly to high court, if anything goes wrong against you, you can miss one option.
3) How anyone can come to know the order will be in your favour without reading facts, issues, applicant and respondent submission. If you are applying in the family court no need to hire a lawyer. but still lawyer fees are vary to vary from different lawyers.
4) Yes you can ask for video conferencing.
Suggestions: Running all 3 cases at a time and waiting for court order so long time. why don't you go for Mutual Consent Divorce. In this you can insert points in your favour in the MoU and get order from court.