Have a plan ready to 'welcome' him to the kitchen... don't present it as "we have to do it this way" and also don't put it forward as we all suck.
Be confident yet willing to learn...
Be honest with what you do well and what you need help with (not so much yourself but your kitchen)
- have a list of your usual in house made items, along with receipes,
- have a list of your usual fast fixes, which companies they come from and how you prepare them,
- be straight with him; are you here to get experience before moving on? are you here for life as you live next door? whatever!
- have a list of things that you would like to change and also a list of things you would not like to see change.
- have a list of the owners things that are taboo! and also what they consider a Sh(&^T list!
Don't just hand them over but keep them on you and use them when appropriate... hell if it's all going bad and to hell and worse - just hand him the F'ing cards and then after he's read them get them back.
A new chef can be a great tool for learning - it can also be ball breaking... take everything for what it's worth. With a grain of salt....
Remember if everything goes great you'll learn from him and be his 'sous' forever - if everything goes to hell you'll still need his recommendation for your next JOB!!!