WordPress Features

Please tell me how to do these two.

Multi paged posts
If your post is too long, cut it up into pages, so your readers don’t have to scroll to the end of the world.

File/picture uploading
You can upload pictures or files, and link to them or display them in your articles. You have the option of creating thumbnails of pictures when you upload them.

I am unable to find which can do the above two operations.

Also is there any website where I can find relevant plugins for all wordpress features?

Regards.