Hello
As Kathy suggested, have a look at the moving forum, there is lots of helpful info in there.
Unfortunately, unless you have close (ie no further back than a grandparent) ancestral ties, or have skills we seek (eg teaching, medical skills, certain engineering skills) or are a citizen of another EU country, then your chances of being allowed to work in the UK are slight, at best.
Have a look at the Home Office site re visas - that may clarify some of your questions.
Border & Immigration Agency | Border and Immigration Agency
Good luck with your attempt to move to Scotland!