How to create personal image gallery ?

Hello!

I am working on website of mine in which i need a small feature less image gallery. The taks will be very simple:

1. Each user has its own gallery.

2. User uploads images into the gallery. The images are given a unique id number and are stored in 1 single folder named "images" or something like that.

3. Now whenever a user wants to browse the gallery only his images are displayed in very small thubnails in 1 page.

So where i am stuck ? Well i have not started this part yet but i am going to soon. But till then i want the help on Uploading of Files, giving then Unique ID in Database. That's it. I just need help with these 2.

Can anyone help me on this ?

Thanks!