The first thing you do not do is just place the new kitty next to your other kitty and wait and see what happens. The cats should remain separated at first. Even a bathroom can be a safe room for a cat, especially because you need to supervise all interaction between the cats in the beginning until you are sure they are getting along okay and you can't do that 24/7.
The age difference between the two isn't much and their size should be similar. There are a couple of things you can do. Feed them both in the same area -- not next to each other, but maybe on opposite ends of your kitchen. The cats will know the other is there, but will be concentrating on the food. You should have plenty of toys for the kitties -- so try to engage them both in play (not with each other) but with the toys themselves. They need to associate good things when they are put together.
Now, I've seen cases where two cats are introduced and get along great immediately. Know that your current cat has claimed the territory and a new cat with new smells is entering that territory. Make sure each cat has their own space. Multiple cat trees, multiple litter boxes. These are a must! It will definitely help relieve much of the stress for the cats. Also know that some times, the cats just don't ever get along -- even after years. you're just rolling the dice. So much depends on the disposition of the cats, their socialization, and how you handle the introductions. If you're stressed out, the cats will sense this.
Do not allow one cat to become overly aggressive with the other cat. Playing is fine, but growling and hissing and fighting is not. You'll have to keep them apart if that happens. We can always hope that they will become the best of friends, but give them time and let them do this at their own pace.
Good luck.
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