How does eBay and Paypal work?

I'm a totally new to eBay even though I've heard of it before. I'm making a paypal account so I could shop online in eBay. I'm planning to buy an iPhone 4S. I'm currently bidding. So I have some questions I still don't get.

How does PayPal work? I know how it actually work but how will it work to the sellers? If I win an auction do I message the seller? What do I do with paypal? Does PayPal let me check my money? Is It like a bank account? Do I send the sellers my paypal account or will it be on my ebay's profile? I'm still making a paypal account and my bank account but I still have no idea. Can you help me with everything?

My Iphone is completely out of storage?

I have like 100 pictures, 20 songs and 5 apps, so that is not the case. I have 5.25 gb of "other". What the heck is "other" and how do i get rid of it? I have restored it multiple times and even brought it into the store and nothing has worked? Any ideas?

How to get these songs off my iphone from icloud when i added ios 7.0?

I recently added ios 7.0 to my iPhone, but all of these songs that i don't want popped up in my music and i can't get rid of them, i know its from the beginning of downloading the program when i agreed to let icloud on the phone and stuff, but i wanna change that, someone help me please, this is Really irritating!

My iphone won't start back up! Why? How long will it take?

So I reset my iPhone settings it went good. But i wanted to erase everything basically erase and reset which i did but now its just loading with the circle thing in the middle with the black screen and it won't start back up even when i connect iot to my computer again.why? Does it take this long? How long does it take? How can i fix this?

Ios7 Imessage and Facetime activation bug?

I have a question regarding ios7. I recently got my iphone 5 to update from io6 to 7 a few hours ago after a day of endless failing to do so, so now that everything is set up, I can't connect to iMessage or Facetime, which is strange because I know for a fact that it was working with ios6 yesterday. I have tried, pretty much all day today to sign into my Facetime and Imessage but I keep getting "Could not sign in, please check your network connection and try again". There's nothing wrong with my network connection, my Wi-Fi is fine. I then try to go to settings and all it says is "Waiting for Activation" on both Imessage and Facetime. Is this a problem on Apples end? Because not only am I encountering those two problems, everytime I open up an app, such as facebook, kik messenger or a game for instance, a notification pops up and tells me that I have to connect to iTunes in order to get Push notifications. Anyone else having this problem with activating their FT and Imessage? As well as the Push notifications issue? Any tips or tricks I can use to Activate my Facetime? All answers would be appreciated.

Can/should I download iOS 7 for my iPhone 4?

IOS came out recently and I've seen the new icons, when I go to download it says I need 2.9GB of space and I only have 8.

Now I have 57 photos, 2 and a half pages of Apps and 43 songs and still not enough space.

AT&T iPhone 4 lock button broken?

My iPhones lock button is broken. I was repairing the screen and then something came out of the lock button and now it doesn't have a click feel or noise and it doesn't work. Does anybody know what part needs to be replaced?

Why Isn't My Weather App Animated in iOS 7?

I had seen pictures and videos of the Weather App in iOS 7 animating (for example: lightning striking if there are thunderstorms or rain falling if it's raining). Mine is just a picture of clouds now, not moving.

Is there any setting I need to change to get the weather animated? Please note I have the iPhone 4 so it may not get this feature?