1) How to label your projects so people can find them, and,
2) how to find projects you wish to contribute to (via a mini walk through the search ...
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I had a same problem but luckily I found some sites which helps you to find issues by different filters.
Check these sites, I hope you will find it useful.
Octoboard
issuehub.io
Up-for-Grabs
To get more information about open source and contribution, I recommend freeCodeCamp guide for Open Source. It is well structured and useful information, specially for beginners.
freeCodeCamp - How to Contribute to Open Source.