Welcome to the forums, Lemonades! I hope you end up enjoying computers as much as I do.
I'm glad to see that you're willing to learn (as opposed to, "build me a rig, please"). That being said, learning about computers, the components and building takes some time. I've always recommended that ANYONE wanting to build a computer (not matter what level of expertise) should spend ~40 hours researching what is available and what they want.
The first start is setting a budget - which you've done. Well done. Word of advice: stick to your budget - don't go beyond it, but be sure you spend every bit of it.
The next part is determining what you want to do with it - which I think you've started. You should evaluate any other work you'll be doing on the computer. Are you an audiophile? Then you'll probably want a sound card. Need a whisper quiet PC? Then you'll have to evaluate the case and fans. I think you catch my drift.
As for suggestions and builds, I recommend you look at other postings in the forum - see what other people are building and what people are saying. Also, you can check out MPC's PC Blueprints
article from November 2012 - it gives you 3 builds at three different price points. These would be good starting points and you can modify parts based on your needs and your budget.
Finally, check these out for tutorials on building PCs:Kick-Ass Ivy Bridge PCSmall gaming PC how-to