Start slowly. If you hurt yourself early, that's what you'll forever associate with skating.
To find a place nearby, I Think just google roller skating and your local area. I would think that there are local groups who'd have some kind of online presence, always looking for new recruits. I don't use Facebook myself, but that's the likeliest online gathering place.
Lean slightly forwards, bent knees, keep your centre of gravity low and use your bent knees as control and, somewhat, shock absorbers, feet in a comfortable V-shape, toes further apart than heels, and just kinda step. The V-shape and physics will start you moving forwards.
After 20+ years of nothing, it took me about two hours of constant skating at an unpopulated rink (kids birthday party) to learn satisfactory cross overs.
Long term, there are muscles in your feet and lower legs that, unless you're a dancer, you've barely used and are important for subtle balance control. These have taken me years to build up, and I've got years still to go.
Ultimately, there's no shortcut, it's all about time spent doing.
Took me 18 months to go from starting backwards skating to be moderately comfortable doing it in a speed skating session. I'm proud of myself for a goal reached, and each goal reached leads to a branching set of further goals to achieve.
And once you've got a set of skates and pads, it's cheap and it's good for fitness.
(For me, it really helped that my kids and nieces are / were really into it. Kids enthusiasm is really infectious).
P.S. running into people is always a risk. Avoiding people is a good way to learn things you didn't know you could do - until you fucking had to. I caused a five person pile up just last Friday. Be polite, be contrite, but be aware this is a risk everyone takes when roller skating.
Also, I roll on inlines, I'm a baby giraffe on quads, it's embarrassing how bad I am given how I'm quite good on inlines.