Jimmy
When you have confirmed that there is no fuel remaining and reset the FAC to get back the characteristic speeds, pilot flying should select green dot speed which will give an approximate glide ratio of 2.5nm per 1000ft (no wind). Weight doesn't affect glide ratio in still air.
So, at a cruise altitude of 38,000ft you can glide for about 95nm still air. Remember though that you need to configure the aircraft before landing which will hugely affect the glide ratio (gear and flap), also you'll need to position yourself for the landing runway which may not be straight in, so you'll need to take off about 5-10 miles for those.
As a tip, when Pilot Flying (from Left hand seat as F/O loses their PFD and ND), I always select the ND to NAV mode 180nm range straight away as this gives you a 90nm range all around the aircraft to select the best airport for an emergency landing (as the best might be behind you!)
The Eng Dual Failure drill should be completed from the QRH immediately and not from ECAM.
Hope this helps.
Pro Spin