There is no harm in filling out questionnaires, but truth be told they're a waste of time and the coaches don't read them. Just a ploy to get you on a mailing list to invite you to camps.
As for the training. I think you need to leave that for the offseason and join a travel team. You're not really a baseball player unless you're playing baseball when its supposed to be played. You still want game reps and live ABs. Even if a coach were to respond to your email, they'd want to follow up and see you play somewhere. By joining a team a coach will also be able to better assess your talent and determine if said schools are the right fit or not and then contact them on your behalf. Start hitting the gym and training now, play HS, talk to your coach about your talent level and go from there. I'm not big on camps and showcases. Others can point you in a better direction, but the main point to take away from this is: taking baseball season off in an effort to train for the next baseball season isn't a very good strategy, especially when you're trying to get recruited.