There will be shooters local to you who reload. Probably one who loads those calibers, too. All you have to do is find one, buy a can of 4831 powder and a box of bullets for each caliber (and a set of dies if your local does not have that caliber).
If you don't know such a person, post a note at the local range.
My father loaded at a friend's house for 20 years. He was never comfortable with the idea of doing it unsupervised and I think he enjoyed socializing with another shooter.
After doing this a few times you will be ready to buy a simple press and load your own at your house. Most of us got started with a friend's help and have passed it on to others.
I hope you have been saving all your brass,