Many of the communities nowadays use Slack or any other team collaboration tool to keep in touch and communicate quickly with each other, so it's not difficult to join them. Emberjs for example, has a very friendly community, if you are interested on it.
Go step by step to avoid feeling overwhelmed by all the things you have to learn. Be also aware of the "imposter syndrome"[1] which many people feel despite of being great professionals. Try not to compare yourself with others too much and congratulate yourself when you achieve something important for you, even if it looks like something small.
A big part of the job will be to keep a good state of mind and leave aside any negative thought like "this is too difficult", "I can't do this", "I'm too old for this", etc.
Good luck!
[1] https://en.wikipedia.org/wiki/Impostor_syndrome