This is just my first full season, so i'm no expert, but this is my advice. If anyone disagrees, i'm open to criticism.

1) re TIE: i'm in Div V and after the first game, i've been blowing everyone out while taking it easy. once your enthusiasm gets up there it's as good as playing normal all the time and you will have enthusiasm saved up for big games. I plan on TIE every game in the regular season.
2/3) Re TL: if your guys are getting a ton of minutes, make sure your trainees are spread out and getting the 60-80 min or whatever at those positions, then i would just buy some cheap junk players to plug into the positions you arent training during your scrimmages. since wins are irrelevant in scrimmages, and you arent training those positions, then it shouldn't hurt anything.
4) definitely try out difft tactics. your team may not be ready for your favorite tactics, but it's something you can look forward to as you build the team the way you want it!
5) Please do. Don't give up!