for your first sigs, they arent that bad, but in the future, there are some things you should remember when making sigs.

off the bat you should work on your text. try and find some better fonts, and usually the simpler the text, the better it looks. renders and bgs are the eye candy in sigs, usually not the text. also, try and add a border around the bg of the sig, it helps loads. not only does it look good, but it makes the sig look finished, and not just a project you've given up on.

as for pop-outs, save the img as either a gif. or a png.
also, make sure when you make the img, set the bg colour to transparent, so you can actually make the sig a pop-out.

keep working at it!