US study and mariage help

Hi, my name is Cindy and I live in Argentina since I the age of 2. Fortunately for me, i was born in Toronto and have kept my passport up to date ever since. I've never traveled back to my home country but I'm planning on doing so shortly because my boyfriend (and future husband) was accepted to a US college. I have several questions regarding my best plan of action.

1) If I would be living in the US with my husband while he study, can he apply for a Canadian citizenship so when he is finished we can move there?

2) Since me plan to get married in a couple of month I was wondering if it is not better to register have a civil marriage in Canada instead of Argentina. Or there isn't any difference?

3) How hard it is to get a job in the US if you are a Canadian citizen?. I know little about this issue and I'm scared since I'm a lawyer here which is a not very "exportable" profession. I was wondering if my qualifications are good, will I be able to work as a assistant, or maybe even a waitress in case of need and to improve my english (my boyfriend is writing for me). Maybe applying for an F2 US Visa is better

Thanks!