Let me qualify myself before suggesting an opinion. I am not with the amateur game nor have I any experience with high school ball. None. So what follows is logic, not experience to where you're about to go.
In my opinion, those metrics expectations are the domain of the high school program that you're about to enter. Different programs have different thresholds of intensity. These programs have a pattern of placing players on the bench, on the field, and even in sublevels or classifications. Incoming freshmen, for example, can be slotted on a "freshmen club" by deliberate decisions handed down by a league or other authority - thus exempting freshmen from JV and varsity ball.
I would suggest looking at the record and tempo of competition from prior years. See how intense, or how high the bar is raised and what demands are place on players. I've seen extremely competitive high school clubs with a rather high water mark with respect to dedication and deliberate focus on nothing but baseball. Some even skirt the governing authorities by being year round programs, and discreetly at that.
Have you attended any games played by both the JV and varsity? Do you know anything about the coaching atmosphere you're walking into to? Do any of your current or prior coaches know of this high school program? What is their opinion of this high school? Were you a program player for you past teams - by that I mean a first string player, a "go to guy?" What KNOWN qualities do you bring to the field that would make this high school want you? Are any of your friends going with you and want to play ball there?
Finally, I would concentrate on what you know and what you can do best. Going into a totally new social as well as an athletic environment can be a big step for you. You'll be going in a lot of directions at once, to be sure. As the offseason progresses, take a look around, see the pecking order of things at your new school and who the big guys are and how their treated. Take careful note of the "clicks" that attract certain types of teenagers. See how you fit in, and how you don't. Personalities are just as important as playing ability, so don't sell that aspect of getting along short. So, be conservative at first, get to know you surroundings and who's "in" and why.
For now, if you haven't started a healthy, well rounded breakfast plan - DO SO NOW. Set priorities for yourself with time management of getting to bed so you can get at least 7 hours sleet, get your stuff organized the night before for school, plan for enough homework time and stick to it, limit social distractions after school an into the evenings, and finally - don't do things off the field that distract from what you do on the field.
This is a big learning curve in your life. Discipline yourself now using baseball as an objective and this pattern of behavior will serve you for the rest of your life.
Best wishes with your new high school and your baseball experience - you'll do just fine.