You want to avoid making the employee onboarding process too seriously. You don't want to make your employee anxious. And you want that to extend to your office atmosphere as well - you don't want employees coming in day in and day out feeling anxious or uneasy.

The best way to approach this is by showing how accomodating you are. That will excite the employee and make them more receptive to instructions and motivated to accomplish them on time. Plan group events and lunches, flatten the hierarchy by breaking the awkwardness between people from different teams and positions and have conversations outside of work stuff.

Check out - employee onboarding services

Crack jokes with members of your staff but don't make it too frequent. Once in a while but ensure you give them a hard laugh