What do I do and where do I go after Edea's house?

there's a lot of part that has something to do with edea's house. which one are you talking about?

The very first one at the start of disc 3.

after that, you'll have to go back to the infirmary to visit rinoa. before you go to the infirmary, review all your junctions(magic, gfs, etc.) because when you're in the infirmary, squall will pass out and yes, another flashback for laguna and kiros, and they will have a battle with a ruby dragon so be careful.

Ah I see thanks for all your help.

But the laguna flash back is boring in that one but as Rinoa said prepare for the red dragon. They are not as powerful as the islands of hell though so dont worry.