SQL Always on

Hi

I have 2 sites ( London & Paris)

I want to make high SQL Always on availability Group

2 SQL FCI on each site and between sites i have to  create SQL always on availability group .

shall all application connected to availability group?

if the availability group active in London , can i make all applications in Paris connected to read only Database copy in Paris ? how can we do that ?

MCP MCSA MCSE MCT MCTS CCNA