Hey Santo!!
There are a few guides available on https://documentation.meraki.com/ sometimes focusing on each product.
MX quick start: https://documentation.meraki.com/MX/MX_Quick_Start
MR quick start: https://documentation.meraki.com/MR/MR_Quick_Start
There are a few MX deployment scenarios here:
https://documentation.meraki.com/MX/Deployment_Guides
I think the smallest one is aimed at a 'Branch' network rather than a home deployment. As such it assumes that there are more than MX in play, as it shows you how to set up Site-to-Site VPN's
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Really though, it depends on what you want to do with your home lab.
Personally, I was happy setting up a couple of SSID's for the Family and for Guests and making sure that all IoT devices were VLAN'd off
One thing you will want to note is that the MX68CW has integrated wireless that will not play well with your other MR AP's I.E you won't be able to roam between the MX(wireless) and the MR's etc...