Ideally you would have the crate open where you are going to use it and put the pups bed in and some toys and it will start lying in it itself. I let my pups use ours that way for a good few days before I ever shut them in.
When you do want to shut the door do it after the pup has had a good play and is starting to look tired pop them into the crate with something nice for them to chew on and close the door. Try to avoid opening the crate while the pup is making a lot of noise and if possible open the door while the dog is sleeping and just let it come out itself.
If you want to use it tonight then if possible you could have it right next to your bed and then gradually move it a bit further out each night as the pup gets used to it.
Or you can cold turkey it and just start as you mean to go on. The pup will prob cry for a good few hours. Mitzy did for about 2.5 hours the first night, then 30 mins later ln. The second night was better then it got worse the third night so exhausted hubby brought her into our bed. She had a few nights there and then when we got Peppa the two of them slept in the kitchen no problem. I dont shut the crate door because I have paper down in the kitchen for them overnight. Some other folk use the crate shut if its big enough to have a bedding area and a paper area and others get up through the night to let the pup out as for an 8 week old its unlikely they will be able to go all night without doing the toilet.
Its down to what suits you, your family and the puppy the best how you do it.
Enjoy your new addition