Chinese language 中文 漢語

Awesome that you're interested in Chinese. A really good website resource is HackingChinese.com which has a lot of free resources on how to study Chinese.

Other than that, comprehensible input, listening to content that you understand 80-90% off is a great way to improve both pronunciation and listening. I recommend Learn Taiwanese Mandarin, Talk Taiwanese Mandarin With Abby, TeaTime Chinese, Chinese Podcast with Shenglan, MaoMi Chinese. Peppa Pig is also great.

I'd also recommend checking up chorusing/shadowing technique, which is mimicking native sentences and words. It's a surefire way to improve your pronunciation even though it's grindy. HackingChinese has posted a lot about it. Also: work on tone pairs! If you know how a word is pronounced with proper tones, you can transfer that pronunciation to another word with the exact same tones.

Having a teacher that can correct you is also great if you can afford it, but with proper self-discipline self-studies go a long way.

Nothing will help more than practice, while you're studying consider anything you pronounce with the wrong tone completely incorrect.

I personally try to use spacial memory techniques to group words with the same tone together, anything first tone I remember above me, third tone below, second tone left, fourth tone right, neutral right in the middle.

The final advice I have is to pay special attention to how native speakers pronounce tones together, for example two third tones in a row become 2,3. Most won't even be about to tell you the specifics so you'll have to learn on your own.

Good luck out there, it gets much easier with time

Get praat and use it to listen to and practice tones.