Hi there:) Im going to be living in Dalkeith. Would it be expensive to say, everyday go on a bus ride to glasgow, edinburgh etc etc to explore scotland, or is it not really? if i want to rent out a one bedroom flat, with my partner, how much would we need to earn to survive with food etc? thanks a lot 
i suppose it depends on where you are coming from, as to whether you will find living here expensive to be honest
compared to most places in England say, living here is cheaper
rent etc
here is a link for rentals
http://www.s1rental.com/renting/search/forrent_search_results.cgi?location=592
that gives you a rough idea how much that will cost
travel? you will be better buying some kind of travel pass, both Edinburgh and Glasgow have great transport links and negotiating both cities is easy
eating, like everywhere else can be as cheap, or expensive as you allow it to be
i hope you enjoy Scotland