Here's my take, but nothing is guaranteed. When it comes down to it, anything can happen.
1. Not really. My guess is the coach is filling up on players, creating competition so that he has a bunch of guys to choose from. At the end of the day, at least 7 guys will be cut since D1 can only have 35 kids on the roster.
2. I would say the playing field is pretty much even, however, the coach may see the JC guys as having more experience than the freshman kids. They have been "battle tested" at the college level. They have seen the next level pitching and next level hitters. However, if a freshman shows that he is mentally and physically ready, he won't play the JC guy over the freshman guy if the freshman guy is better.
3. I would think that the freshman scholarship guys are safe for the spring - as long as nothing drastic happens on or off the field. Those scholarship guys count towards the roster whether they are on the roster or not. So, if a scholarship guy got cut, the roster could only be 34. I don't think the coach would want that.
4. Coach might not have an actual depth chart, but you should know by the end of the fall whether you will be starting or not. I would think that the coach would be playing the top tier guys together in the inter squads and games at the end of the fall. Most coaches will have an end of the fall meeting with each player to let them know where they stand. I would think the bottom guys will get cut. He may keep one or two border line guys around to fight things out in January, but I think you can take that as bottom of the depth chart since you would basically be competing for that 35th roster spot.
5. You should get a good idea at the end of the fall meeting. Ask your coach where he sees you fitting in. I would think most coaches will be pretty up front.
6. I would say yes. Coach probably isn't going to move a kid out of position if the coach still wants him there.
Of course all of this is speculation. I agree with what others have said. These are all really things you cannot control. What you need to worry about is your own performance. As a position player, hit the ball and you will find a place in the line up. If you're a pitcher, throw strikes first, get guys out and you will get some innings.
College ball, especially at the top D1 level is extremely competitive. Every spot needs to be earned and the coaches job is to win, so the best will be on the field. Do you believe you are one of the best? If so, go show it. If not, coach will see that and will not have confidence in you. As a freshman, you will be competing against guys that are 2, 3, 4 even 5 years older than you. You absolutely need the confidence to go up against those guys and believe you can hit them and believe you can out field them.
You seem to have a lot of doubt. That needs to change. Believe in yourself and your abilities. As someone else mentioned, the coach recruited you because he saw something in you that he liked and thought you could help the program. Show him he was right with his assessment. Don't worry about all this other stuff. You're on the team - go show them that you should be a starter. That's all you can control.
Good luck!! Let us know how things go over the fall.