An implant is typically the best option, but it's hard to say without seeing you in-person. An implant is a titanium piece that goes down into the bone, which should last you for the rest of your life! You're also only dealing with one tooth. With an implant, we typically suggest bone graft and membrane, which helps to build up that bone loss, so the implant holds steady and secure in place. With a bridge, you're tampering with multiple teeth, some of which are most likely healthy teeth. It really depends from person to person, but an implant is typically the best option.
In most cases, after a root canal you would need a crown. Teeth become very brittle after endodontic treatment, and crowns are regularly required to strengthen a brittle tooth.
This is a tough one! It's difficult to answer fully without seeing you in person. However, my recommendation based on photos would be to at least consult with an Orthodontist prior to jumping into veneers. If your bite is off, and you get veneers, you'd most likely either pop your veneers off, or even fracture them. Veneers are very fragile, and if your bite is off, they will most likely not stay on.
Whitening will not change your ability to eat anything. However, there are certain foods and drinks that can stain your enamel easier than others.
The shape and shade of your permanent veneers will be completely different than your temporary veneers. However, once you do get your permanent veneers, your bite still may be a little off. That can be easily adjusted once in place.