Pricing
Operations Manager Suite has a completely free model meaning if you want to try out all the functionality you can do so. The free version has limitations on the size of data it can collect but perfectly adequate for small environments and testing.
There are a few paid options to choose from E2 giving you everything including Backup & Site Recovery and E1 which contains the basics. You can also choose to select each module on a pay as you go basis but the costs are a lot more than an E1 or E2. A nice include is the license for System Center which can save you money or add additional value.

More details about the pricing can be found here,
https://www.microsoft.com/en-gb/cloud-platform/operations-management-suite-pricing
Deploying
OMS is easy to deploy and get started with. First, you’ll need an Azure subscription and then you need to create an OMS portal. Click Add Resource and search for Log Analytics.

Azure
If you have machines that you’d like to monitor within Azure its really easy to switch on. Browse to your Log Analytics Instance > Select Virtual Machines > Click each of the VMs and click Connect to monitor them.

Agent
If you want to track On Premise or other Cloud servers you can browse to your OMS Portal typically something like https://example.portal.mms.microsoft.com or by clicking OMS Workspace from your Log Analytics instance within Azure.
Click the Settings Cog > Connected Sources > Download.
From here you can download the setup files and see the required keys which will be requested during the installation.
