Taken on a network that's flat

Hello, i've taken on a network in a school that's flat apart from a VLAN for the phones.

I have no real skill in networking at all but I know enough to know that I don't know enough to sort this :). The switches are all HP 2920's and a core switch which is a HP 5412.

​

From what I've read, it'd be great to have servers, printers, physical security devices (gates, doors) all in their own VLANs (or one other VLAN) - can someone offer their opinion on this?

​

My other question is, what would be the best route to have someone come and sort this - is there a place to find network consultants/freelancers, or would it be best contacting an MSP? Or is it worth me picking up a book and learning it all?

​

Thanks