When business grows large enough to hire your first employee, it's kind of like your baby cutting its first tooth. There's some redness, soreness, general irritation, but in the end, it's an exciting milestone. Pediatricians and dentists will tell you to start caring for those teeth immediately. Be gentle, but ensure to brush that itty-bitty white chicklet twice a day and watch it grow strong and be joined by others.
As a parent and a small business owner, communication and patience are keys to success. Correcting improper behavior immediately is a good rule of thumb, but exercising discretion so as not to embarrass your staff in front of clients is just good tact.