16 piglets wow, its a lot to get your head round.
First of all divide them up into boys & girls so you know what you've got.
Get them advertised as 8wk weaners to fatten in time for Xmas pork. Girls always sell better than boys so they will probably go first. HH gave you some ideas where to advertise.
When you know what you've got left aim to send the boy pigs for pork at around 22 - 24wks old and grow any girls you have left on for bacon, hams, gammons etc. around 8mths old.
Already mentioned don't undersell your product and don't rely on your butcher pal who says he'll try them in his shop (theres a tendency for them to drop out at the last minute when their regular suppliers get arsy!)
YOU must be prepared to work at this people aren't just going to come to you out of nowhere you need to get out their and plug your pigs and pork.
HTH
mandy