Cody Glass
Just as is the case for Nick Suzuki and Erik Brannstrom, Glass' contract doesn't necessarily mean he immediately begins getting paid. For players signing entry-level contracts, the terms don't officially take effect until the player turns pro.
For a player like Cody Glass, especially when factoring in George McPhee's preference to be patient with prospects, this contract will more than likely not go into effect this season. Barring unforeseen circumstamces, Glass will play junior hockey this season with the Western Hockey League's Portland Winterhawks, his club the past two seasons and a regular Memorial Cup contender.
Just note that Glass would be permitted to play up to nine games for the Golden Knights this season, and would still not begin the contract that he signed on Saturday. He could play up to nine games for the Golden Knights (or come to training camp) and not yet begin his NHL contract.
After nine games, however, he would officially turn pro and begin his contract.
Glass wouldn't be eligible for the AHL's Chicago Wolves under this contract until the age of 20, two years from now. The only way (besides a tryout of up to nine games) that Glass could play in the AHL before age 20 would have to begin with him making the Golden Knights as a full-time player this season.
If Glass surpasses the nine-game mark and stuck with Vegas this season, he could potentially be sent down to Chicago full-time before the age of 20. The contract he signed on Saturday also applies to AHL service, although it's not possible for him to start this season as a full-time member of the Wolves.
If Glass played two more years of junior, he would be allowed to begin this contract two years from now in the AHL, if he's not yet ready for NHL duty.