Def get a job with the Federal government. Veterans get preference in hiring, so you'll have a good chance of landing a job. Also, a lot of the jobs align with military careers. ADA will protect you for some cancer types (look into it).

As for retirement. I'm assuming you served 20 years and will be getting disability on top of that. So you'll be making 40%+ of your highest military pay. I think you'll be fine in terms of retirement (especially if you work).

Also, veterans get free schooling. So feel free to get a degree if you want it.