Hi!
Luckily he is young enough for you to train him that crates and puppy pens can be fun! You need to make the crate/pen somewhere that he wants to spend time. When you leave him ensure he has some chew toys and better still a kong toy filled with something yummy (there are kong recipes on this forum). This will keep him occupied and distract him from wondering where you are.
He will need regular toileting but if you keep track of when he last went you will know whether he is just trying it on or needs to go out
. Make sure you never let him out when he is whining only when quiet. 
My Cockerpoo is nearly six months and we have had her two weeks. She is terrible when we leave her in the crate, she gets into a complete tizzy, sweating, panting, howling and whining. She then goes quiet and you think she must have settled when actually what she is doing is destroying her latest bed or blanket!
I am sure Archie will be fine
, he is only little and they learn things so quickly. 
Luckily he is young enough for you to train him that crates and puppy pens can be fun! You need to make the crate/pen somewhere that he wants to spend time. When you leave him ensure he has some chew toys and better still a kong toy filled with something yummy (there are kong recipes on this forum). This will keep him occupied and distract him from wondering where you are.
He will need regular toileting but if you keep track of when he last went you will know whether he is just trying it on or needs to go out
My Cockerpoo is nearly six months and we have had her two weeks. She is terrible when we leave her in the crate, she gets into a complete tizzy, sweating, panting, howling and whining. She then goes quiet and you think she must have settled when actually what she is doing is destroying her latest bed or blanket!
I am sure Archie will be fine