Firstly the table that you choose to put the images in depends where you want them displayed. If you are intending to display an uploaded image in the description of a link then you need the extra column in the Links table.

Second, the size variable it is complaining about is not the size of the uploaded file - it is the maximum length of the name of the file.

You need to just choose a directory where you want the files to be saved. If it doesn't already exist then you will need to create it and make it writeable.

It is some time since I've looked at displaying uploaded images, but I think that you will need a global to display the file unless you use jump.cgi - I'm not sure whether this is explained in the docs but there are plenty of threads about this in the forum.

Edit: Take too long with your reply and someone gets there before you