I'm having trouble figuring out when to use vosotros in a sentence. Do I just use it when I'm implying to friends?
As a Spanish pronoun, you only use it when you want to contrast those people and others, or highlight them for a very unusual reason. In other words, 99% of the time you don't say "vosotros", or natives will be trying to guess what's so unusual about the situation requires the pronoun to be mentioned to stress it.
In any case, its use is restricted to Spain, and only for informal usage. For formal one, in Spain we use "ustedes", which is the practically the only one used in Latin America.