I've reviewed your laptop, it's basically a better and more up to date one than what I'm using to create this post now. I have a 2.2 GHZ i3 processor and only 4GB of RAM. Your Graphics card isn't as powerful and if possible I'd recommend upgrading it a bit (Mines 1GB, that's all I can remember) but what you have is plenty for general RuneScape usage as well as Youtube, etc.
If you can, try go to a store which has a 14" screen laptop and sit there and fiddle around on it, see if it's big/small enough.