About To Become Main Sysadmin. Any Cues And Tips For Me Please?

Hi everyone,

I'm currently the IT tech of a medium~small company. I've been an IT tech for ~2 years, but have worked around computers for 8 years. We're currently doing business with a MSP that's done us dirty in the last years. We do not want to work with them anymore and we will not renew their contract.

Instead, I've been asked to take charge (with the help of an another experienced technician at least), of the company's tech infrastructure. My bosses are very happy with the job I'm currently doing and believe I'll do just fine. I've followed the A+, Net+ and Sec+courses and I've got a bachelor's degree in computer science. I know my way around computers and am resourceful, but I've got to say that suddenly taking charge the the whole place is a tad stressful. I do not have years and years of experience nor the combined know-how of a MSP. There are certainly many concepts I know of, but have never touched or implemented... Not that I think I am unfit for the role or not up to the challenge, I would like some insight from you people if you please...

Anything I should keep in mind, think of or consider? Any hints, cues, tips and tricks for me? Most of the technology is already in place, on-site. It's not like I have to build a server room or configure the switches from scratch...

I'm not here to hear your opinion on wether or not the company's decision is foolish or stupid. Just looking for genuine help please.

Thank you!