1. Make it visible to read.
2. Try and make it quite simple. Dont bombard your text with, drop shadows, glows, satins color overlay etc.
3. Use the default fonts. It will always work.
4. If there are two sentences for example on ur 2nd sig u cud have "Born to Destroy" in bold text. Then you could write your name underneath "Bigpete" in the same font but smaller and diff color. - OR - write ur name in like a handwriting style. Like uve literally signed it.
When i first started using PS, i used so many effects it was unbelievable. Now, i barely use any. Probably Gradient overlay and sometimes drop shadoww and thats it.
Hope that helps .
Metal1