Hi - welcome to the forum
I have 2 doodles and both loved their crates. I got the medium size crate and found this enabled the pup to stretch their legs.
Although Kobi my eldest doodle is a big guy and I did get him the xxl crate when he was older. Do you have an idea of what size your pup will grow to??
The crates sometimes comes with a crate mattress, but I also purchased cheap single duvets from Asda and hunted in charity shops for single duvet covers and used these to make a nest inside the crate.
Also a cover or blanket over the crate, like a kiddies den gives the pup a sense of security. I found the crate suited both the hounds and myself and I knew they were safe when I had to go out. One thing I would suggest is getting a couple of puppy kongs and when pup is in the crate give one to enable chewing. Also be prepared for the amount of space a crate may take.
Like Anny says get a lightweight puppy collar initially - they are fairly cheap but never leave the collar on your pup whilst in the crate.......I only have collars on my hounds when we go out walking.
Looking forward to seeing some photo's. Good luck.