Max -
Can't argue with anything Eric said... a couple thoughts to add though. (I started windsurfing in 1977, was a "garage" Windsurfer dealer for a while. I've probably taught 80+ beginners over the years. Just so you know I'm not talking out my arse
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Lessons are great if you can get them. You're welcome to come over, but it's about 3 hours drive...
There are a bunch of "beginner" boards that are 9-10 feet long and 3 feet wide. They are great for the first two hours because they are very stable, but they move through the water like a bulldozer. Get something 11-12 feet long, 28-30" wide and make sure it has a centerboard. A board like this will move easily (aka "glide") through the water (like a canoe or long kayak) and is way more fun than the "bulldozer" boards. Also, the soft deck boards are really great when you are learning.
For a beginner sail/rig, you want light and tough. I also think that beginners do better with a sail that can luff (easily depower when you sheet it out). The majority of modern sails do not luff, but not all
I love HotSailsMaui SuperFreaks because they are light, tough and they luff. They are great sails for learning, but they also a great for freeride and they are fabulous for wavesailing (I use them on my dedicated waveboards as well as my SUP in waves)
So my recommendation (under $3k) for gear would be:
a) a Windsurfer LT board and the standard 5.7m sail/rig. (the LT also makes a good SUP paddleboard if there's no wind)
b) a Windsurfer LT board and a HotSailsMaui Superfreak (sized 5.0 ~ 5.8 depending on how big you are)
Choice b) would be more flexible in the long run if you end up addicted and want several boards and sails.
If you can find one, a used Mistral Superlight is a great board for learning, and you can get them very cheap. Mine was free!
I will add some more to this tomorrow, along with some links. Beginners have a habit of buying the wrong equipment, often on the advice of the people selling the gear. Someone with experience (who isn't trying to make a buck off you) can help you get good gear that will last and be something you want to use in the long term.
Drew