Ha. Yeah. Well a tag is a signature like these:




Some good advice is go to Deviantart and download brushes. As much as I hate that site they do have REALLY good brushes. I would suggest a good set of grunge brushes, I usually use motion and rust grunge.
Look up tutorials and do them to get good with making them, dont just do the tutorials, play around with it and find your own effects.
Find renders
hereSome good tutorials can be found at
Cold Steel Studios