First, there’s no guarantee an independent Scotland would be allowed in to the European Union without adopting a number policies, not least of which is converting its currency to the Euro.
Second, they must receive unananomous approval from the current members, any number of whom are harboring nascent separatist movements within their own borders.
I’d say the odds of Scotland being rejected for EU membership are substantial, whether they want to join or not.
If Scotland sez yes to the Euro — and it’s been floated that they may just continue to use sterling, and not worry about their own currency — there will be pressure applied to let them in. Farage knows that a separate Scotland in the EU means one more vote against UK interests, and having Scotland adopt the Euro would mean, the UK and its Pound (England, Wales, N Ireland) would shrink a bit, an outcome much desired by France and Germany.
Are there any good articles of the mechanics of a Scotland breakaway?