Stop in for a cup of coffee

@Sublime one of our resident experts along with @zkx14 ...

Auto or wheel gun?
Personal preference on caliber.. for me, reliable brand, slim design, light in weight and not super expensive so if it ends up in an evidence locker you aren't out a big chunk of change.

Springfield, Smith & Wesson, Glock and Ruger come to mind

9mm is a fairly light round and not overly expensive to train with
9mm is my choice for many reasons, 9mm is a nado round, always available compared to others, inexpensive, and comes in many fashions, target rounds, hollow point, even gut busters , I hope to find a good 9mm rifle I can afford so I can just keep stocking up my 9mm rounds