1. You can get a sleeve if you want to, but it's not necessary.
I've had my left arm amputated twice before and have been able to live a normal life without any problems. I don't think it's necessary to have a sleeve. If you do choose to have a sleeve, make sure you're getting one that fits properly. There are some sleeves out there that are way too big and cause a lot of pain. Also, make sure you're having it done by someone who knows what they're doing.
2. You'll need to learn how to use prosthetics.
You'll need to learn how your prosthetic works and how to care for it. Make sure you know how to clean it, oil it, and adjust it. You'll also need to learn how to put it on and take it off.
3. You'll need to find a good prosthetist.
Make sure you find a good prosthetists who specializes in amputees. Most people who have a limb removed end up going to a doctor who does general orthopedics. These doctors aren't trained to work with prosthetics. A good prosthetist should be able to help you figure out what size socket you need and where to place it.
4. You'll need to buy new clothes.
If you decide to go ahead with a sleeve, you'll probably need to buy new clothes since you won't be able to wear your old ones anymore.
5. You'll need to get fitted for a new prosthesis.
This means finding a prosthetist who specializes in amputee prosthetics. Once you find him/her, make sure you tell them about your situation and ask them questions about your options.
6. You'll need to start taking medication again.
When you have a sleeve, you'll need to start taking medications again. Your doctor may prescribe you different types of drugs depending on what kind of amputation you had.
7. You'll need to deal with depression.
Depression is something that many people struggle with after losing a limb. Make sure you talk to your doctor about ways to combat this problem.