IMHO you could not do any better than to try to live in the town where you are going to work, unfortunately I don't know Cobham, having said that Surrey is a well off area and in general is good to raise children. You may be bored to death, your town or village may not have a cinema and if it does you will have only commercial movies, in general there is no real cultural life to speak off, but if that is not a worry you should be fine, in any case London is half an hour away but for children is not too bad since there are plenty of leisure centres and green areas .

Second best is to live in another town that is in the same train line as the one where you work. Check the train company's timetables (South West Trains) to see trains that would pass through Cobham for alternative places where to house hunt.

In Surrey there is no metro, there are trains with stops normally quite far from each other and buses, with a varying degree of reliability, most people rely on a car, specially if they live in a small village, although nowadays you can order your shopping delivered to your door from all major supermarkets and if you are disciplined you can get some use from the buses, but the fact that they are used mostly by pensioners, children and people in low incomes should tell you that a bus, regrettably, is not the best means of transport for busy people living in Surrey.

Hope this helps.