No problems at all, no secrets here :)
I would say kitchenware is a really good choice for your sales avenue, good quality cookware always sells at the right price, and if you are going to make the stall an ongoing thing, you could well develop some loyal customers!
I would suggest you stay clear of un-breakables, dinner sets and the like. Liquidators aren't know for their general care in shipping lots, and if it can break easily, it just might!
In regards to suppliers, I would suggest looking at via trading, excellent surplus supplier. Tim from Titan Liquidations (an approved supplier here) is another I would talk to.
When you do talk with any liquidator, you need to keep asking questions until you are completely satisfied with the load you are getting. There are many, many pitfalls when dealing in this type of market and the better informed you are on exactly what you are buying, the less chance you have of falling into one!
My advice, try and do business with one of the two I have suggested here, they will both be very happy to answer any questions you have in regards to products, and will volunteer a lot of information that you don't even ask for in an effort to make sure you know what you're buying.
One last tip, you will most likely find things like saucepans without a lid, a knife set missing a knife, these types of things are common in most surplus loads of this nature. Take a knife set that is perhaps missing one knife, don't try and sell it as a complete set, that will devalue it because it's not complete. Break it down into individual components and sell it off piece by piece.
Things like quality knives will sell well individually, even the empty knife block. Always make sure the buyer can see everything, they way they may offer you a price on the whole set, and then you can take it or negotiate a better price with them.
No matter what the item is or if it's damaged in some way or not, don't just consider it valueless, people will place their own value on an item, you just have to let them see it's available!
Good luck with it : )