Everyone here is spot on - don't buy any of your boating essential gear yet. Doing so right now would be like a 16 year old going to buy a car all by themselves. Wait to see what you like about kayaking and go from there.
BUT if you were going to invest in one item to make your instruction time more productive since you have boldly chosen March to get started, invest in a dry top. It will make it so much more fun to try stuff. And NOC should have some layering pieces of underneath it.