Fresh meat in the rift needing some guidance in order to survive.

So i'm new to league of legends, I have been watching some pro games and stuff to see how the game is supposed to be played, I think I have become decent at it so far and I have decided to main Top but I need to know how to do builds and which items I should prioritize, I know there are sites that recommend builds and stuff but I don't want to depend on a website I'd rather learn how to do things myself, so is there a way to learn which items work best for the champion you are using and things like that, and also should I worry about counterpicking? If you think it's best for me to just stick to a website and copy builds and runes from there than link me a good website. Thanks in advance! {{sticker:slayer-pantheon-thumbs}}
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