First off, what your asking to do is more artistic than anything else. My best advice would be to go to a tutorial site for PS7 and search for tutorials on "fading images", "fading effects", "how to fade" etc. etc. Read a few of the tuts and then apply one or more of them to your image. Keep in mind that "fade" is actually somewhat general in terms when it comes to PS7. Do you mean you'd like to change the opacity of the picture, or that you want to fade it from top to bottom/bottom to top or that you'd like to make it appear old by making it look faded? Or perhaps it's another type/version of fade that you're thinking that I've missed (like sepia toned, old black and white etc.). Let me know a little more specifically what you'd like to do and I'll try to help some more
Now, as far as putting "writting" on the picture, did you mean just input text or did you actually want to doodly with a pen or paint brush? If you just want to input text, that's rather simple: Just click on the text tool in the tool bar to the left of PS (default location is to the left)(keyboard shortcut is to press " T "), then click on your picture where you'd like to put the text. Now, you can choose the font that you want now, or you can type in what you like, highlight it all, then start picking different fonts to find one you like. You can also do the same with the size of the font. Type what you want, then hit enter on the number pad NOT on the keyboard (above the right shift key, as this will act as a "return" key and start a new line), to "set" your text (meaning that this will make it so that you're done typing in letters). You now have text on your image that is it's own layer, so that you may edit it or move it as you like. To edit it, click the text tool, then click in the middle of the text (word) that you typed in. You should now see a blinking cursor, and be able to add/delete characters. To move this text, click the move tool on the tool bar (keyboard shortcut is " V ") then just click and hold on the text (or anyplace in the image) and you'll move the text layer. To "fine tune" move your text, once you've selected the move tool, use the arrows to move them a tiny bit at a time, or hold the shift key and press an arrow key to move them more at once (I believe it's 1 pixel at a time without shift, and either 5 or 10 pixels at a time while holding shift). When it's all said and done with, save it as a " .tif " or a " .psd ". Doing so will allow you to edit your text at a later time. Now, go to Layer>Flatten Image (or flatten layer?). Now, save it as a " .jpg ". Now you can easily email this .jpg, as it's a smaller resolution than the .tif or .psd.
If you want to use the paint brush, spray brush, pen/pencil tool to hand write words in there, simply select the appropriate tool on the tool bar, check your settings and start doodling! Using these tools will not allow you to move the text/words that you just did. It can be done, but I won't get into it right now, as it's slightly confusing.
Honestly, I haven't used photoshop in close to 4 months, and I've done all this off the top of my head, so if I've messed something up, or you don't understand, please let me know and I'll help you more.
Hope this helps!