Suggestions needed: How to iron duvet covers, bed sheets, curtains?

Ironing is one of my favourite household chores, but I really struggle when it comes to ironing beddings or curtains using standard iron and ironing board. Double duvet covers are way to big for the board. Same problem with curtains.
When I try to spread one end, the other is usually dragging on the floor. When I fold it in half and turn it, it simply creases the sections I went over just a few seconds ago, so I'm just wasting my time. It's absolute nightmare, especially that I don't want my clean sheets to touch the floor. I was browsing online to find any useful tips, but can't find anything special that could really help me. I've heard about spraying plenty of starch while ironing. But I'm not so sure about it, cause I like my beddings soft (not hard and rough to the touch).
Also heard about replacing iron with steamer, but I have no idea how to use it.
So how do you make you bedding look nice? Any ironing tips or other useful suggestions please..

 

Thanks a lot vakulamsundar It sounds good. Gonna try it in a moment. Best regards