Poll
63%
0%
0%
38%
Hell, my first sigs were ridiculously basic as well 😛
I'd say to make sure you don't distort/warp the renders when resizing them; hold down the shift key while you're dragging it, this will keep the aspect ratio the same.
If you're looking for brushes, check the Resources thread that's pinned at the top of the forum, I've compiled tons of links to programs, tutorials, brushes, renders/stock, fonts, etc. Pretty much anything you'd need for making sigs.