Regarding working with eldritches:
First off, establish what you are planning on accomplishing. Is it gaining knowledge, is it worship, is it simply fascination?, etc. It will likely be difficult for people for others to guide you without information of your intent in this first.
I now personally disuade people from engaging in worship, though there likely is a way to do that carefully.
Either way, you should read through primary source material, look at some pop culture material, and look at aesthetic and information blogs so you can have more of literal idea what you are getting into.
Read up on eldritch energy, read up on eldritches and their nature. Become as analytical as you need to. Doing all of the above will give you a decent starting point for handling eldritches.
You should be careful. As long as you use common sense you will likely not run into problems. Do not let anyone take advantage of you. Furthermore, I would disuade against evoking/summoning anyone until you have at least introduced yourself, and do not do it solely for fun– remain respectful.
Peruse A Treatise on the Outer Gnosis. It is a wonderful document, and frankly is a better introduction to this than what I am telling you now.
Important— if you are attempting to reach out to gods and they are not getting back to you, you may want to contact someone who is somewhat experienced, or use divination methods to figure out what is going on. It is not necessarily indicative of anything, but it is something to be mindful of.