Retrospect is too late, but very educational.
I Made Something
Here's my first halfway quality wood working project. I made it from the cheapest wood I could get. I wanted to avoid ruining good wood as I practice. This was a simple free plan I found somewhere on the internet. I have already thought of one huge improvement. You can't see it from the angle I took the picture from, but the end of the carriage bolts that fix the table legs onto the table are visible at each corner. Yech! AFTER I was done I found several other possible ways of having a similar strong adjustable attachment that would not be visible. I can get the simple, cheap hardware from Lowe's in the same place I was able to get the carriage bolts.