Sailing schools are ideal because you can quickly learn the basics plus the necessary safety drills on the water. But if sailing schools are not an option, maybe get in touch with a RAID group in your local area. They will probably be very helpful in finding you a boat and you could sail & learn with them on a casual basis. RAID groups can often be found on facebook.
(just as an example): Dinghy Cruising Australia
www.facebook.com/groups/612113892272272/cheers,
sf