Generally, every player that enters the college baseball environment is initially surprised at how competitive it is, regardless of level, and at the extent of time commitment. That said, if my deduction is correct, the school you are going to probably gives you the best chance at competing for playing time sooner than later. So, do everything you can between now and then to be prepared academically and athletically.
The small average class size and school size will be in your favor when it comes to handling the school load along with the baseball commitment. Do your best to develop good relationships with your instructors. They can really be of help (or hindrance) when you are missing classes due to game travel. There doesn't appear to be a city of size within at least a half hour drive, so you won't have much to distract you and that's OK, because you will have plenty to keep you busy with school and baseball.
Don't expect much in regards to spectators at games. You will be playing for you and your teammates. Aside from a handful of parents, you will have to talk some of the young ladies on campus to come out and cheer for the team.
Hopefully, you can be part of helping the school develop more of a winning tradition. The new HC looks like he has a decent background and will likely be organized and keep you busy with a fairly heavy emphasis on conditioning. So, your typical day will likely consist of early morning workouts, classes, practice, field work, study. Get some meals along the way and that's pretty much it. As someone else mentioned, at least D3 is a bit less of a time commitment than other levels. Sometimes they start later in the fall, have a bit less practice and play a bit lighter schedule. You can ask the staff for their workout routine and this may be a good head start for you. Also, if you happened to meet any of the current players or know any of this year's newcomers, they can make for great resources for the types of questions you are asking.
Congratulations and good luck!