www.Bitcoin.org - has a lot of good material for people just starting out.
https://howtobuybitcoin.io
http://lopp.net/bitcoin.html - has a lot of more technical stuff, but also a lot of good advice and info for everyone
https://www.reddit.com/r/Bitcoin/comments/6jlop4/rbitcoin_faq_newcomers_please_read/
Coindesk.com has a good section of guides for people new to bitcoin.
Hopefully this will be enough to answer a lot of your questions. Best wishes!
Good sites mate, even I read them and actually learned some useful stuff. Thank you. To reply on the post, when you say get "started", I reckon you want to learn how you can have holdings or perhaps earn right? I think the best way is for you to start how most people start, since your only 17 years old, the best way would be to join in ICOs. By doing so, you can get to earn some tokens with which you could exchange for altcoins or bitcoins, this could help you get some assets in your holding. Then, you can try trading them for cash, or you can hold on to them for a larger profit come the time the coins you were awarded would gain more value.