I have wifi in the house as you would expect and would like to install wifi in my garage and limit it to internet access only with no access to any devices in the house. I'm trying to find instructions on Google but they are all for just adding second wifi's with full LAN access, so am I right in thinking it's the following....

1. Add wifi router in garage via ethernet to a LAN port from the house router handling the DHCP (house is on 192.168.1.*).
2. Assign an IP to the garage router within house router address range.
3. Assign IP of 192.168.2.* to the garage router.

Does this mean nothing can be seen/shared between 192.126.1.* and 192.168.2.* ? Do I need to disable DHCP in the garage router ?

I'm pretty sure I'm missing something.

Cheers