HI Lias

You'll get lots of good advice here...and the best advice would be to go out and do it. You don't need expensive gear to have fun backpacking!

The most important things are to stay warm, dry, and well fed. After that, everything seems easy.

If you're interested, our website has a ton of suggestions, as well as a lot of easy solutions to the situations you face when you go backpacking.
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Check our our website: http://www.backpackthesierra.com/

Or just read a good mystery novel set in the Sierra; https://www.amazon.com/Danger-Falling-Rocks-Paul-Wagner/dp/0984884963