The order in which to spend money on wake boarding is:
-A good non stretch tow rope with a wide handle. Not a ski rope.
-A wakeboard with a constant rocker that is big enough. Used is great and if it's too big it just makes it easier to get up.
-Some ballast bags to add weight to the boat. Perhaps one 400# or maybe two of some weight so you can adjust where the weight goes.
-A tower.
Really good wakeboarders can do flips and rolls behind a SeaDoo. That's what technique does. The tower helps with air time, can let you store gear, and makes the boat look 'cool'. Neither are essential to see if you like the sport (unless you have a 12 year old). The biggest trick to getting some air is the size of the wake and the ability to load the rope. Start with doing Bunny Hops behind the boat or off to the side. You ride flat and quickly force the back foot down. That loads the rope and as it is not stretch the board gets pulled quickly up the water ramp you just made by pushing your rear foot down. Pop, you are in the air. Not far but practice and you'll get the feel. Do the same thing when you get to the bottom of the wake as you cross it and the ramp is bigger so you pop higher.
To get a good wake run at about 18mph on a GPS. Boat speedometers are not great at that speed. The intent is to be below planing speeds so your hull is pushing water out. Trim up about 25% to push the stern down more and steepen the wake. Add bow weight to make the wake deeper but keep the bow up more than you would cruise at. Adjust and play around as you figure out what works for you.
When first learning, don't worry about adding weight or trimming the bow up. Just drive about 13-14 mph and get towed inside the wake. Learn to spin the board, travel with either foot forward, and Bunny Hop. Those basics really help and just time on the board will make you more comfortable. If the board is small you might go a bit faster.
Enjoy. The non stretch rope is better for kneeboarding and hydrofoiling also.