Hi there I intend to set up my first website within the next few months. However I need to either ad a prefix or a suffix to my chosen domain name.

either:

myxxxxxxxx.com
or
xxxxxxxxonline.com

What effect/difference if any does having a prefix before the search term (i.e. "xxxxxxx") have on how my site is returned in search engines?

Also I had recently submitted a web site to google about a month ago. I went from page 5 to page 2 within a month. Last night it was in the middle of page 2. this morning i have checked google and its gone (not in first 20 pages). The site had a few paragraphs and and also an RSS feed from another site. Was trying to get it established. If i search for my site specifically in google it does come up. Anyone any ideas where it has gone and how i can get it back?

Thanks
B