There's no reason to apologize, if anything such assistance is part of the point of this forum after all lol
While you can ofc simply replace the broken link with a master, it would be better to invest in a chain breaking tool as then you're able to fabricate any length of chain you wish. While there are many types of chain breakers, I prefer the following style as it seems far more capable of dealing with a wider variety of chain as well as being durable: Amazon.com: MOTORCYCLE DIRT BIKE ATV CHAIN LINK BREAKER TOOL: Automotive
As for the chin itself, the kit supplied chains are renowned for being of an extremely low quality. The 415 is often replaced with a #41 roller chain which is slightly wider but has the same pitch. It can be found at almost any farm & tractor supply or a decent hardware store for roughly $10 for 10' for the generic "heavy duty": Amazon.com: Roller Chain: Everything Else
Here's a handy chain chart in case you need it;
Azusa Engineering, Inc. Online Catalog - Roller Chain, Motorcycles, etc.
Welcome to the forum BTW