How will I fix my Lenovo z580 that I spilled water upon?

I know I shouldn't be eating and drinking near my laptop, but I do it anyway, and I apologize. However, I recently spilled water (and I mean water, not cola or anything; just water) on my laptop, and I waited for it to dry off, but I didn't take any parts out because I know nothing about computers. Now, when I turn it on, it seems to work just fine, but some keyboard keys aren't working and the touch-pad is unresponsive. Because I didn't take any parts out, I don't know if the spill affected anything else, so first, I would like to know what else might have been affected, next, I would like to know if it would be expensive to get someone to fix this or if I should just get another laptop, and finally, I would like to know where I could learn about fixing computers in general so when something like this happens again, I will be able to figure something out.