Windows 7: What can I upgrade on a Samsung RV515?

So, I've had this laptop, a Samsung RV515, for awhile now, and I felt it was time to upgrade it. I would just buy a better computer, but being only 14, I don't have to much money to spend. I was originally planning to upgrade my RAM from 4GB to 8GB, but I'm not sure that is the best route to go. the kind of things I want to know is if I can or can't upgrade or replace my processor, graphics card, etc. I don't know a whole lot about computers, so any input would be great. Also, it may be helpful to note that I haven't done anything to tweak and/or upgrade the laptop yet. Thanks to anyone who can help!

laptops are restricted to 3 main upgrades:

RAM (the Crucial.com website seems to indicate that your laptop can accept an additional 4GB RAM bank (DDR3 SODIMM, 1066MHz of speed). This is useful if you have tons of windows and programs open, but with that processor I don't know if it's going to be so noticeably better.

Memory Storage devices (HDDs, SSDs, DVD drives can be removed and replaced with additional HDD/SSDs) These in general improve storage space (HDDs) or system responsiveness and load times (SSDs a lot, high end HDDs quite a bit but not anywhere near SSDs)

Battery (better endurance)

(theoretically you could upgrade processors as well, but it's extremely complex because they weren't designed to allow it to be done and anyway it's very very rarely worth it, given your lack of experience I'd discourage that course of action)

This is the price for having something portable. If you don't need something portable, investing in a good desktop computer would give tons of bang for your buck.

I'd personally save the cash for a new one, either laptop or desktop, if you really want to see improvements.
Say what you'd like to do with it and someone will point you in the right direction.

Thank you bobafetthotmail! I'll definitely put those things into consideration. Again, your reply is a lot of help! I probably will just aim toward getting a good desktop computer.

You can post a new thread to ask tips on what to get for the new computer, possibly in the gaming section.
Being inexperienced you could blow money in well-marketed but inferior products.