Head of sales advice

hey! I work of an Australian fintech startup. as we scale, I'm first in line for the Asia-pacific head of sales role. 

I've managed small business teams before, but have never held a head of sales position, specifically. The team will only have 3 reps when I enter the role, with the current forecast to have us at 10 reps within 12 months.

1. for sales reps - what would be your best advice for your sales manager?

2. for sales managers - what do you wish you know in your first 12 months as a sales manager ?