1: I did on occasion assess the merits of people to undergo training as part of my academic role. However, this was in the past. Your first is notable which university was it from - the answer would make it more notable. Biochemistry is a tough subject and very relevant and would indicate to me you would not overly struggle with the level of the theory. You would however be required to demonstrate something beyond this. As assessors we are spoiled for choice. What practical skills could you offer? Do you have any experience in any caring role? There will be plenty of other people with firsts and you'll no doubt want to shine out over and above them to get into a reputable institution. That will facilitate a good career pathway. A good medical school will stand out for your whole career and so will the hospitals you trained at. Think about what type of medicine may already interest you and position yourself accordingly. But be realistic.
2: Realistically 22-23k the BMA will have the exact figures.
3: Your ease of work abroad will be determined by how attractive you make yourself. The hoops will then disappear. I did elements of my training in Australia and certain units there are internationally recognised. I know of great work being done in Toronto but the competition for there is high. Also bear in mind Australia is not what it was ten years ago and you may have a soul destroying experience when you as a reg are earning far far less than the family next door as the dad in that house drives trucks for the mines!
Overall though I would suggest you get some direct experience if you haven't already. There are aspects to modern medicine that are not really shown on the TV eg the modern nursing role etc and how as a junior you will be expected to and would be well advised to know that plenty of nurses will and always will know more than you - learn their value early a good nurse is better than a good doctor because it's pretty easy to get a good doctor - one day you may well have your own team and most of that team will be nurses. Know what they can and can't do what they do and do not want to do etc. Unless you go into private practice in a select area then you are not going to ever be making megabucks especially when you consider the amount of time and money you will sink into the whole process. If you want to do it well then you need to be aware what a life consuming process it can be at times and how it will impede your social and family life. Moreover, there is no guaranteed job at the end of the road and you may find yourself in a cutthroat competition to get a position and if you don't get it being prepared to take something else eg the two people I went up to ended up doing something they didn't really like and never wanted to end up in those last few years and the drive for the one post split up good friendships that had been there for years. You mention both of you moving abroad are both of your ready for the sacrifices you may have to make because their will be many and even more if you want to give it a really good go and do it justice eg do you and your partner want children? Is your partner willing to be a stay at home parent or will she want a career? If yes then are you willing to have your children raised by someone else whilst you look after possibly other peoples children.
I would not want to discourage you but it would be remiss of me not to point out what a difficult road you are choosing if you wish to do it well. Because your competition will likely be as clever so you will have to match their fortitude, determination and sacrifice. There are a few GPs on here who you will better advise you if that is a road that appeals, I think Pikeypriest (or something like that) butchers people with sharp implements and there are quite are going through med school atm. But I hope I can offer you some perspective from someone who started went through and came out the other end with the things achieved that need to be achieved and the lessons learned along the way and the consequences that some may not think about. It's a rewarding job but don't underestimate the amount of your life it may take both in time and effort but also sanity and health.
Being I am feeling nice:
http://bma.org.uk/developing-your-career/becoming-a-doctor/entry-to-medical-school
http://bma.org.uk/practical-support-at-work/pay-fees-allowances/current-pay-levels
http://bma.org.uk/developing-your-career/career-progression/working-abroad/canada
http://bma.org.uk/developing-your-career/career-progression/working-abroad/australia
