Hello,
Here is a link with pics to help you get you set up done. Altought I am not DIR, this link from DIS UK is very good.
http://www.dis-uk.org/gallery.htm then go to twin setup in detail. To get your best setup it all depends on your type of 1st regs, on link there is for Scubapro and Apex. In my opinion first you have to have a model to start on and then is diver preference. For example I dive independends for now, and as half of my diving is wetsuit diving I use double inflator, so more hoses! Another good idea is to us Ap Valves hoses which can be custom cut by user.
Regards and enjoy
Pierre Farrugia