Hiya

I'm not hugely experienced myself, but no - it's not food orientated training if you're wanting to walk them with the board.
For 'sit' and 'lie down' (even 'trotter' if you want

) you can use a food reward and train them in the way you would a dog, it might be best to start with this type of interaction - depending on what you want your pig to be able to do.
For board training, it's more getting them used to going where YOU want them to go. The first couple of times I even went near my Large Black with the board she looked at it, snorted, jumped backwards then started chasing her tail in circles (mental pig !) but after 2 or 3, 20 minute sessions she started to get the idea.
You'll need a board and a stick (this can be a garden cane or old piece of waterpipe) the stick shouldn't be used to hit them, it's more a gentle but persistant tapping to keep them moving as you (attempt) to guide them using the board. The theory being they'll only go where they can see
It's guarenteed to have you in stitches (especially if you are a spectator during early training sessions) but once you've had 2 or 3 go's they will start to respond. Limit the 'session' to around 20-30 minutes. It may seem like a long time, but if your pig gets used to only walking for 5 minutes, that's all she'll walk for

If you were ever to find yourself in a large show class, she'd need to walk for up to 30 minutes. But by all means start shorter and work up to it. From personal experience - young pigs (less than 4 months) can be harder to train - but they weren't KK's - the ultimate laid back pig, so you might find it goes great from the start.
Either way - please let us know how you get on and if possible post a video

HTH
Karen x