Best answer:
You go from London St Pancras. There is a Kings Cross St Pancras station on the Underground, and you go there to get to St Pancras. Kings Cross St Pancras is only called that because it serves both stations and they happen to be just across the road from each other, so the Underground didn't bother building...
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Best answer: You go from London St Pancras. There is a Kings Cross St Pancras station on the Underground, and you go there to get to St Pancras. Kings Cross St Pancras is only called that because it serves both stations and they happen to be just across the road from each other, so the Underground didn't bother building two Underground stations, just one big one to serve both! Kings Cross and St Pancras are very definitely separate mainline stations, though, so don't end up in the wrong one.
East Midlands Trains operates trains to Sheffield, so look up train times, fares and book your ticket on their web site
https://www.eastmidlandstrains.co.uk/ You can ask for tickets to be posted to you, or if you want to go too soon for them to get to you by post, choose to collect them at St Pancras. (This may also save a postage fee.)
You will find different levels of fare and this next bit is true about all British train companies. An Anytime ticket is the most expensive and does just what it says - you can go any time. An Off-Peak ticket is only valid outside of busy times so you'll see that you can't buy that for some trains. Advance tickets are the cheapest but there are only a limited number on each train, so if you want to go this week, there might not be any left. You have to travel on the specific train you booked to go on and sit in your reserved seat. Advance tickets are only singles, so you need to buy two if you want to come back, and you won't find them under "Return tickets". So if a return is what you want, look under singles as well!
You can book Advance tickets up to 11 weeks in advance and the further ahead you book, the cheaper they will be. So a tip for the future - plan ahead if you can.
Reserving a seat is free so think about that to be sure of a seat. The site will probably do that for you automatically anyway.