Mid 2010 Macbook A1324 Hardware Advice?

So I bought a macbook from a refurb reseller and all is great. The only downside is the thing is a pinwheel nightmare. To my knowledge it runs 2g of ram on a 250g hdd. I'm guessing the pinwheel is an effect of both of these key pieces of hardware that determine speed are much outdated to be running El Capitin. Looking to resell my 5 on eBay and see if I can get upwards of 100 for it in current condition. I'm curious about the difference a crucial of samsung 850 would be? Is it noticeable by any means besides a speed test for simple browsing and music usage? The price tag is a big difference but the storage and read/write are fairly comparable. Then on the ram this model states it can only handle 4g even though some say they put the max 16 in. Will that make a difference? I plan on going with the 4g since that would double its current state and since that is what apple states all of the other hardware will handle running at its fastest so it seems to me 16g would be a waste? Do I have this figured out at all? Is it really as simple as copying my os to the new ssd and unscrewing a couple screws and removing a ribbon cable or is there something else I should be doing?

Sincerely,

Pinwheel Nightmare!