@theshmike is exactly right.
If I can offer general advice: Get some basic information first, then work backwards from the call you want to use to see what it needs.
These call names are based off the names at https://dashboard.meraki.com/api_docs
You will typically need to know your org ID, your network ID, device serial number, and/or client ID.
Org ID: For multiple orgs, assume you'll have to use "List the organizations that the user has privileges on" each time. If you have a single org, you could run it once and record your org ID someplace secure-ish.
Network ID: Once you have the org ID, you can get your networkID(s) using "List the networks in an organization".
Now that you have those, look at the other variables that your target call needs.
Serial number? You can get that using "List devices in an organization" OR "List devices in a network". Or look at the dashboard.
Client ID? Use "List the clients that have used this network in the timespan" to get a list of client IDs, then find your target based off its mac address.
Always double-check how timespans work, by the way. It may have changed, but used to be some were seconds and some were done in Unix epoch time.
