If there is a tryout, does making the team mean that you will have regular playing time, or will you have to compete for playing time?
I knew many people over the years who assumed that if they had tried out and been accepted on a team, they would get equal playing time. And I have to say, it seems a fair assumption: why else have a tryout? Then when the team was run as a "best players play" team, people who paid for hotels for weekends so that their son could pitch one inning or get one at-bat were pretty mad.
I suppose another way to do it would be if you are offered a spot, ask "how would you plan to use me?" and see what they say.