Scottish independence

[Fazerider]

what, for instance, will be the debt situation for Scotland after?

Well that's another reason why there will be a currency union.  If there is no currency union, then Scotland is free to walk away from UK debt.  Under a currency union we will have to shoulder our fair share of the debt.

Yes, Alex Salmond declared that Scotland would walk away from their portion of UK debt if they were denied the UK pound, but since the UK Treasury had previously announced that the debt would be underwritten in the case of independence his threat is empty. It would also be counterproductive.
Superficially, it looks like a great deal for an independent Scotland, but it isn't. Scotland would still be liable for servicing the portion of debt… starting out with zero credit history is bad enough, refusing to pay interest on the existing debt would instantly make Scotland a defaulting nation so would push up borrowing rates a lot further.
In the event of a "yes" vote (once all the political grandstanding is over and the two sides have to deal with reality) the most likely outcome would be to allow Scotland to continued use of the GB pound in exchange for ceding some control over taxation and spending.