Where in Scotland are you planning to go? It's hard to answer if I don't know where you're staying. Get a guide book (just borrow one from a public library) and see what looks interesting. I don't know what YOU would think is interesting.
As you mention flights, that means ending up in Edinburgh or Glasgow. There are other airports but they don't have international flights. Or you could fly to London and go up to Scotland by train, which is a nice way to do it. You get to see all the countryside on the way. It takes 4-5 hours but by the time you've done all the fiddling about you have to do at airports, it's not much quicker to fly, and you're not In a hurry, are you? And you get to see more than just clouds.
Without any ideas of what you would find interesting, I suggest staying in Edinburgh. That's where all the historical stuff is, being the capital city. Be prepared for it to be cold and windy.
Of course if you're from outside the UK you need a passport, and whether you need a visa as well depends on your nationality. If you're a citizen of Canada, the USA, Australia or New Zealand, you won't, you're welcome for up to 6 months just as a visitor, but check, and do that early enough so there is time to get one.
The currency is of course the British pound so get some pound notes from your bank but debit and credit cards are widely accepted. Tell whoever issued your card where you're going or they might block the card, thinking it's been stolen. Scottish banks issue their own notes so you might get some interesting ones in change! It's difficult to spend them elsewhere in the UK so try to change them back into your own currency before you leave.
How familiar are you with Scottish accents? If you're not used to it, you could even wonder whether the people are speaking English at all - it IS English, but very strongly accented. Find videos of Billy Connolly speaking on youtube - if you can cope with his very strong Glasgow accent, you'll be fine. It's not so strong as that in Edinburgh.