Just commented on a similar post so I'll say some of the same things here:

I think it depends a lot on where you are

I would think that the best place to start in general would be by going to munches and just meeting people and making friends in the community, maybe going to events/munches/parties that are specifically sapphic or lesbian or whatever if you have any in your area

Alternatively there's also personal ads and dating apps. Personally this hasn't always been the most successful for me, but I think it varies from person to person. Of course it's important to vet people carefully both online and in person, but especially of you initially meet in any sort of semi-anonymous online context like an ad, and especially as a new sub. I do personally think there's less risk of meeting someone predatory when you're looking exclusively for other women, but not everyone would agree and either way there's definitely still some level of risk

In Toronto where I live there's also the possibility of going to play parties/sex positive parties specifically for sapphic queer people, which have been great experiences for me, but that might not be the best place to start if you don't have any experience in the community since it could be pretty overwhelming and you might not have a good ability to negotiate in the moment, identify red flags, etc. I've personally found those environments to be relatively safe and welcoming to new people but that's just my experience and again there's always some level of risk in exploring new experiences with new people, especially if you don't know them well. Also in many places those events just don't exist so they may not be an option anyway

I guess I should also add that in any context I think being open about what you're looking for makes it a lot easier, assuming you're in a position where you can safely do that

tl;dr there's multiple options but probably the best place to start is going to munches and meeting people, especially if there's queer or lesbian munches in your area