First off, welcome to Variance! There are lots of good Docs around here to help you get situated, but I'd especially suggest reading What is Variance? to understand what's happening.
Ok, now that you've created your account, it's time to start Following Accounts in order to fill your Streams. When you get started you'll have one Stream called YOUR NAME's Stream (only replace YOUR NAME with your actual name). By default when you hit Follow on any Account or Contact it will get routed to that Stream. The best thing to fill that stream with are your most important Accounts, so why don't you search for those and start following them?
You can also create additional Streams by either navigating to your Streams page and clicking +Add Stream or by hitting the little dropdown on any Account or Contact and clicking Add to new stream.
Once you've followed some Accounts, you should start to see events flowing into your Stream. Don't be alarmed if you don't see any yet, we won't get notified until users from those accounts take actions in your system. Either way, now is a good time to connect Slack to your Stream. One of the things that makes Variance unique is we make it easy to get your data wherever you work. To add a Slack channel the channel just needs to exist in Slack (you can go make a new one now). Then you just click over to your Stream Details tab and find the Slack channel (we'll autocomplete for you) and click Save.
That's it. Now you're good to go. Events should be flowing and you will get notified in Slack when new ones come through. But what if something is too noisy? Good question. We make it easy to hide different Event Types and Contacts if they're filling up your feed with useless events. To do that just click into the Event in question and find the Actions menu in the top right. In the example below, I'm going to hide the `Stream` page visit event because it happens too often and is making it harder to see the higher-value Events in my Stream.