Sorry but you don’t seem to have any idea as to what you are doing and should outsource before you make some very expensive mistakes.
Coming from working in state schools any project that cost more than 10k required quotes from at least 3 suppliers, spending more than 10k in a year with a single supplier also brought more scrutiny.
Having managed many school ICT projects costing tens of thousands each I have never paid a supplier to provide a quote as part of the bid process so I don’t know why you think there are consultation fees.
You don’t use domestic broadband contracts in education settings, when Ofsted visit and find you don’t have both filtering and monitoring systems in place they will shut you down it is a legal safeguarding requirement and is in no way optional even if you only have one class room. Either you use an educational broadband provider or you have to purchase your own filtering solutions and you then still need to purchase monitoring systems such as Smoothwall Radar.
Also what happens when the line goes down and you have to wait a week for an engineer because you have a home broadband level service agreement?
Who will be your data protection officer, who is going to write your CCTV policies?
You know that your CCTV system needs to be registered with the ICO and that you are subject to freedom of information requests to access the footage and that you need a data retention policy and data protection impact assessment?
Why do you want to view CCTV footage from home, you know all CCTV access is supposed to be logged?
Ideally you should have designated CCTV operators that have been appropriately trained. Schools don’t always have this but at the very least they need a basic understanding of GDPR and must have an Enhanced DBS certificate and been vetted by your safer recruitment officer.
You are confusing equipment like ring with what is required in any education setting they are not remotely the same.
You would have a NVR either with the cams cabled directly to it or put on a VLAN, you would need comms cabs, router, firewall appliance or cloud solution, possibly a layer 3 core switch, Edge switches, POE switches, 10Gb fibre links between buildings, access points, uninterruptible power supplies and so on.
PC’s need to be managed either with a server running active directory, group policy etc. or cloud based with Azure and Intune. All users must be authenticated sharing logins / using stand-alone PC’s simply isn’t acceptable from a safeguarding point.
Any mobile devices need to be managed with an MDM e.g. Apple school manager used alongside something like Meraki.
Your budget is pitiful a Promethean interactive board alone could cost over £2k.
You would have a door access system such as Net2 and electronic locks and intercoms not some domestic ring garbage that won’t work if your internet goes down.
Also why are you posting this on a gaming forum and not somewhere like Edugeek?