How-to RED/ASG setup with 8.3xx

OK, this shouldn't be this difficult. But I don't know enough to make it work.

I have an old ASG 220 rev 2 running 8.305 and a shiny new Sophos RED 10 rev 3.

I used the deployment helper to set it up. Plugged it in, after a few minutes everything came up green on the RED and in the RED management on my ASG.

I went back to my previous how-to thread and set everything the same as my other RED and........NOTHING. Now that time I was still under v7. So I'm missing something. So I deleted everything and started over. Right now I have a clean slate. I just ran the deployment helper and haven't touched anything else.

Can someone give me a step-by-step checklist on what I need to do in order to have my RED network and my internal network communicate? Just like if I had a 1000 mile long ethernet cable between the two? (Without bridging interfaces.)

Here's my setup:
Internal network 10.0.0.1/16
RED network 10.0.10.1/24 set up in Standard/Split

I set two firewall rules, one to allow any traffic from Internal to the RED, and the other to allow any traffic from the RED to Internal.

Right now I can't ping from either side or access a PC on either side. I made sure the have the ASG forward ICMP requests.

I don't want to bridge the interfaces either. I tried that with my original RED and didn't like it.

Thank you for your time and for any help.

Ben