Hey, we can help you here.
See, ummm... "GB" stands for "gigabyte" it's a measure of storage. Like the volume of a box or bottle, sort of. Basically, the more of that stuff you have, the more things you can store.
6GB would be the size of "RAM" there, also called memory (full form is random access memory). You don't store your files here, but the computer needs it to do its stuff, like calculating things and so on (which it's always doing, even if you're just watching youtube).
Now the 320GB refers to the storage capacity of the hard drive. Here's where you install Windows, your programs like MS Office, internet explorer, etc. and your personal files (which you access through windows).
From the purpose you intend to use this for, this is more than enough.
You may want to save some money and get only 4GB of RAM, 6GB is overkill in your case, though if you want that extra memory it's up to you, because as far as i can see, it'll be pointless.
Live streaming will depend more on your internet connection than the RAM and hard drive.
Would you be able to tell us which processor (CPU) this laptop uses? You may want to post a link to the product page.
If it has something called an "Intel Atom" processor, please stay away from it! 😀