Battens 101

I'm not sure if Batten questions go under sails, rigging or misc, but I'll put it here and if I'm wrong GL can just add it to his list of site adjustments to make
I won't need this for a few more months, but it'll give me time to put it on the list of gotta-do's before we hit the water.
As mentioned elsewhere, my DSII came sans-sails, and being "very" budget constrained at that time, I purchased an inexpensive used set (Jib & Main) on ebay (well undersized) thinking I wanted to hurry and get on the water. (best laid plans, but fortunately we didn't get onto the water this year... different story)
The sails arrived with one batten. I don't have it in my hand (I'm not exactly sure what I did with it), but I think it's about 20-24" long, 1/2-5/8" high, more or less rounded diamond shaped on a cross section, and probably plastic or fiberglass.

It looks like I need three all together. I've read several posts about them, and recall on those posts that generally they are different sizes, etc.
So finally my question - Other than length, is there anything magic about batons? Do they come in different rigidities, do I care about a about anything other than just having some on this junk set of sails? To that end... since I'm just learning to fall off the horse, do I even need them initially, or just sail saggy until I order some new sails this summer?

I won't need this for a few more months, but it'll give me time to put it on the list of gotta-do's before we hit the water.
As mentioned elsewhere, my DSII came sans-sails, and being "very" budget constrained at that time, I purchased an inexpensive used set (Jib & Main) on ebay (well undersized) thinking I wanted to hurry and get on the water. (best laid plans, but fortunately we didn't get onto the water this year... different story)
The sails arrived with one batten. I don't have it in my hand (I'm not exactly sure what I did with it), but I think it's about 20-24" long, 1/2-5/8" high, more or less rounded diamond shaped on a cross section, and probably plastic or fiberglass.
It looks like I need three all together. I've read several posts about them, and recall on those posts that generally they are different sizes, etc.
So finally my question - Other than length, is there anything magic about batons? Do they come in different rigidities, do I care about a about anything other than just having some on this junk set of sails? To that end... since I'm just learning to fall off the horse, do I even need them initially, or just sail saggy until I order some new sails this summer?