Oh good idea! I have two pens right now as that is all my yard can fit! (I'm definitely over my legal limit for the city).But I have Wheaten Marans and a few Ameraucana's, so I'm hoping to read up on the breed standards for those!
Marans are pretty recent additions, so you'd need a new version of the SOP for them.
Ameraucanas were admitted in 1984, with 8 varieties, black, blue, blue wheaten, brown red, buff, silver, wheaten and white. I believe lavender has been added recently, too.
Cocks, 6.5 pounds, cockerels 5.5 pounds, hens 5.5 pounds, pullets 4.5 pounds. They can deviate a little but from standards weights but not too much.
All varieties should have slate blue legs. Black and lavender can have dark slate legs or black legs. Bottoms of feet should always be white, never yellow.
Those are some basics.
Google images searches are helpful. Look for photos of birds at poultry shows or show quality birds of the breed/variety you wish to see. Or go to poultry shows and see if they have your varieties. After judging, the tags with placement of best of breed, best of variety, and 2nd, 3rd and so on will remain on the cages until the show is over. That is a really good resource. Also, try to get acquainted with breeders of your chosen breeds so you can get advice. This forum is a good resource for that, but also online searches could lead you there.
Best of luck!