Making CSA Army Guide
If you are struggling to play as CSA, I suggest you start on medium or lower, pick arms agents to get a starting population of rifles, pick industry to get a population bump.
When you get to your in game policies, bee line any of the enlistment term policies to get more men, and then get to conscription. Do what you gotta do to get your troops up, and trust that you will equip them with all the rifles you will get from battle captures.
As the CSA, you have to get your numbers up (using recruitment offices, militia acts, and conscription), make sure your commanders aren’t idiots (alot of them are in the beginning), and arm with the best weapons you can at the time. You will probably need to import rifles from Britain or Austria to arm your troops with until you can build up your weapon making industries. Save your Mississippi rifles for sharpshooters. Don’t waste them with the main troops. They can sit on flanks and attack way out of range of the main assaults. At least one brigade in a division needs a good weapon. So if you have springfield muskets in your division you need a springfield rifle in one brigade. That prevents the Union from sitting away from your line with better rifles (usually springfields) cutting you to pieces.
As mentioned above, use cavalry to scout (with evade turned on in case they run into something) then bring them back to your line during the main engagement and put them on the flanks to flank any main assaults. You can also use them to charge artillery battalions left alone on the flanks behind the main assaults.
I also group my artillery in their own division. It makes them easier to move and keep away from assaults.