If anyone has any good ideas please post them!
My ideas so far are:

1.Drumline Physical fitness training
2.More Drumline Practices

What exactly does this have to do with marching?

My ideas are as follows
-Have marched more than 1 season so as to know what is neccesary
-Be able to lead people

People need to respect you before hand.

That or you need to gain their respect somehow.

I'll bite, even though this has nothing to do with marching in general.
A few of the most important things to being a good drumline captain are:
skill(s), respect, the ability to motivate people, also, good writing skills are very helpful. Here's why
Skill: of course the section leader has to be able to play, however is your skill p enough to be able to teach or coach the younger portion of your section? The title section leader comes with a small teaching job. To be good at it, you have to be a good teacher

Respect: yes! respect is one of the most important aspects in being a good section leader. To be able to coach and lead a drumline, you have to respect certain aspects of your individual players. Even things like some one isn't as devoted to the drumline as you are. The sooner you respect things like that, the sooner you can get around them for the better of the group.

The ability to motivate people: this should be self explanatory. If you can't motivate people, how will they work?

i hope this helps

"It's either eduction or elimination." ~from the movie the fox and the hound, lol. Ask yourself, what you've learned from being a drummer. And what you've noticed about the program you are in. As captain you should be able to comprehend what's going on and should also know a good way to run things for your program.
Getting advice from others is great, but if you're the captain, you're going to need to learn how to figure some things out on your own, too. People will be coming to you with questions as well. I think the more you educate yourself, the better you will be.
With more knowledge you are usually repected more by the drumline members. Usually captains are better/know a little more than the rest of the line (not always the case). If you also know about other sections like guard, brass, pit... they will respect you a bit more as well. When you struggle on something, and find a way to get through it, you may be able to help other members if they get to the same situation, because you have experienced it.
Know your line. Get to know more about not just the sections, but each player. There are small things that you really don't notice on a daily basis.
If someone is better than you... I'm not trying to be mean... but they are usually looked at more for the spot. So, educate yourself, and start climbing further up the ladder.

Similar topics been discussed 'round here quite a few times. If you search the forums, you'll probably turn up a bunch of threads you might find useful.

In short, I think it boils down to one main thing: Lead by example. Don't try to tell people what to do. Show them what to do by doing it yourself. Be early. Stay late. Help others. Show up to rehearsals with your music already learned. Stay focused during rehearsal. Take perfect care of your equipment and uniform. Keep your drum tuned and maintained and show others how to do the same.

As far as implementing ideas you might have (like physical fitness and more rehearsals), discuss them with your instructor or teacher. If they agree that they're good ideas, let a staff member implement them. As a student, you shouldn't be giving orders or assigning things. It can lead to awkward situations, resentment, and rifts within the line when other students disagree with you.

You can think of it sort of like the military. Your line is a squad. You're the squad leader, sergeant. Orders come from above -- what to do, how to do it, and when to do it. Your job is to rally the troops and make sure those orders get followed.

Always put the line first and foremost and yourself second.

I fully agree with SkyDog. It is important to know exactly what method of leadership to use and when to use it. Make sure you know everyone on your line VERY well, if you don't you wont be able to get in everyone's heads. It is important to know the quirks of each of your linemen so you can better tailor your teaching and leadership to the requirements of each person. It takes most people a very long time to get good at this, and I think you are making a great effort by asking this question of people who are more experienced than you. It shows that you care about the success of both your teaching and your line. Don't lose that, and you will be fine!

I think this is very important if you want to be captain. If they don't respect you they will not listen to what you say.

Be able to think quickly on your feet. Be able to make people listen to you. Maintain a close relationship with bd and other student leaders.