Some professional software such as TrueCoach or Trainerize can help to make your clients experience much smoother and make you appear more professional. Some kind of scheduling system such as Calendly can also be very helpful. You should understand how to program effectively for your clients. Shadowing other trainers can be very enlightening too. Source: almost 2 years ago

I've used Google Sheets in the past, but I currently utilize TrueCoach thanks to it's more professional user interface and various other quality of life features. Source: about 2 years ago

I've used award.cat for this. They'll run searches for a small fee, or find an optimal one and walk you through any necessary points transfers, etc. Not really worth it for domestic flights, but they did find me a better deal for international business class than I'd found myself. Source: almost 3 years ago