Lol, I'm not sure you should have started out with your own domain. You probably should have started on a free sever.
You know how on your computer, you can click My Documents and it shows all your files. Thats all uploading jpgs does, is stores them in a online folder called yoursite.com. In order for images to show up you need to create an .html file thats tells your site what to do with that file. HTML stands for Hyper Text Markup Language, and it really is it's own language. In order to make a website you need to be able to write things in that language.
To learn html I suggest you go to lissaexplains.com and start from the beginning. Once your compentent in Basic HTML you can search other sites such as w3schools.com for some cool codes.