Welcome to GT and GT Reloading.
Good advice here so far.
Easy check - size a case, then try to start a bullet in there. If it goes in, your problem is the sizer. You shouldn't be able to get a bullet in a resized case with your hands. Next, look at flare - you just need to open up the mouth a teeny bit so that you can start a bullet into the case. Don't overdo it. Taper crimp is just removing that teeny flare after the seating die has pushed in the bullet. This is easy to overdo as well. Use just enough so you can drop the cartridge in your chamber (take the barrel out of your gun first) and it sits flush or slightly below the barrel hood. It should fall out easily.