Now that you have a couple azalea, you will want to buy a bag of kanuma to use for potting. You use it straight. Sifted.
Now...
Look carefully at each tip. Is there any evidence of the old flower? Like the ovary might still be there? If it is, cut it off. You don't want the tree spending energy trying to make seeds. It would be right at the base of where the new shoots start.
Look carefully at that junction. Often, azalea produce 3 shoots. Sometimes 4. Reduce them to 2. Remove the one(s) growing on the bottom or the top. Keep the side by sides. While you're in there, remove by either gently pulling, or cutting off the old dark green leaves from last year. Especially those on the bottom.
Still with me? Good. Now finish by removing any leaves growing downwards on the new shoots, and cutting back the new growth to two leaves on each new shoot.
Doing all this will probably remove 2/3 of all the foliage on your tree! Be brave! The tree will be better for it!
I don't want to take away from your tree, I'm posting a before and after of one of my azalea so you can get an idea of the process.
Before:
After:
Trust me, it will grow back!
Why is this necessary? (And it IS necessary!).
See how dense your canopy is? Sunlight cannot reach the interior. When that happens, the inner branches die out. You're left with foliage on the outside, and an hollow interior, with no foliage in close to the trunk. You don't want that. But it happens to most novice bonsai enthusiasts!
Look carefully at the "After" image of my tree. See the interior twigs? All those are now exposed to the sun and will thrive. If I had not cut back, the would likely have died off! Those interior twigs will grow, and I can make pads, and I'll have something to cut back to when the existing branches get too long. My tree is just beginning to build ramification.
Courage!
Now is when it needs to be done!