Hi Dispatch the cheap boards they use for the school are probably soft tops and if you make any sort of progress in learning you will soon outgrow them, they are very floaty and are valuable for a couple of lessons then a hard board is the real way to go. They are cheap but IMO not value for money.
Why not hold off on buying any board and have a couple of lessons ,and also go see the guy that spoke to you, but a custom board is probably a little wasted at this stage of you journey, but going to his shop will certainly help you understand all the technical stuff.
Take your time and also have a few hire sessions after trying the school.
Once you learn what's what, you can haunt Craigs List and Ebay and see what boards come up there and have the knowledge to buy.
BTW there are many good boards for sale from people who just didn't understand how much there is to surfing and dropped out
