1. wheres a good place to get MIBs from and how do i install and implement them?
To poll specific OIDs in private MIBs, you can use the Universal Device Poller:
2. i want to setup alerts for when server's etc. go down how do i achieve this easily, the options seem overwhelming to an extent!
There are some alerts installed by default which perform what you are trying to achieve.
In the Advanced Alerts: Alert Me When A Node Goes Down
You should read the chapter 9 Creating and Managing Alerts of the administration guide:
Are you possibly interested in some Orion training options? If so, I can contact you by private message. Let me know.