Im really confused

I'm really confused.

You need the apostrophe because you are combining 'I' with 'am.' So it's I'm.

Hello everybody!

You could also use 'everyone.' But 'everybody' is usually a compound word. Also, when you use '...' it should be 3 periods, not 2.

I'm planning to buy the SAMSUNG GALAXY ACE S5830.

Again, 'I'm' needs the apostrophe. And 'planing' is the act of soaring through the sky. 'Planning' is the act of intending to do some action in the future.

And I'm wondering if you would recommend buying it?

'I' is always capatalized no matter where it is in the sentence. 'Would' is asking someone for some kind of opinion, or a consequence of something.

We already know that you are asking us of our opinion, so you don't need to add yourself in this sentence again. Simply adding "buying," the action, is good enough.

So: "I'm wondering if you would recommend buying it?"