None of us here can tell you what a typical settlement from VAC is for your injuries - there seems to be a fairly wide range, and sometimes it isn't entirely clear how they arrive at the final percentage. What I will say with your VAC application, is be as honest and detailed as possible in the pain/physical/psychological impact, and family impact as possible. This will help them determine the settlement. Both VAC and the Royal Canadian Legion can help you prepare your claim. These are free services, and I do recommend them. I've been working with ill and injured soldiers for a number of years now, and I know how hard it is to sit down and complete these forms.
First off - have you been in touch with the local Integrated Personnel Support Centre? They can help you in determining which benefits and services you are currently entitled to through the CAF. They can also help you in coordinating any Vocational Rehabilitation. If you need any contact info on how to reach them, send me a message, or email me at paul.barnshaw@forces.gc.ca, or call at 613-995-5085.
The IPSC can provide access to funding for services such as groundskeeping and snow removal. They can coordinate Return To Duty programs, or Voc Rehab. If your injuries require and sort of home or vehicle modifications, they can coordinate and fund it.
You've mentioned PTSD, and I would also recommend that you look into joining a local OSISS group (Operational Stress Injury Social Support). Just being able to meet with people who are dealing with the same issues can be very beneficial (I know, I've been part of OSISS for several years now).
There is also support for your wife - it is very hard for our loved ones when we go through this. Unless they are a Mental Health professional, nothing in their life has prepared them for this. OSISS does have support groups for spouses as well. There are also support systems through the Military Family Resource Centre - they have a Social Worker Family Liaison Officer, whose works to help the families, and if needs be, direct them to the right resources.
Finally, you're not alone - don't isolate or withdraw, don't give up on a future. If you need help, reach out for it, there are many of us who have gone through trials before, and are willing to help.