A few pointers if a vet has the time please.

Brand new to the forums and even the knowledge there was a Dark Souls community, hi!
Anyway, i would love someone to point out a few things for me, (if they can be found in other threads please just point, but any information would be great).

First off, Soul level. Around what point would i find more people to play with or against, as i havn't come across a great many people yet (109 currently).

Also, loving the co-op action, are particular bosses more likely to have people looking for buddies than others? (Similar question for the pvp element, though i am sick of getting ganked on the way to Ornstein and Smough).

Oh yes, i'm on XBL i imagine that'll have some bearing on the above.

Thanks for any help. Praise the sun!

Really depends on the area for most popular levels... This is a good guide to go on.
https://2img.net/h/i1117.photobucket.com/albums/k589/vlahka/DarkSouls-Co-opguide.jpg

what soul lvl gets the most pvp? well it depends on what area you are in.
for instance if your sl 70-80 and you go to the forest, there will be quite a bit of pvping going on.
now dealing with the co-op for bosses the most popular are smough and ornstein, rock golem, four kings, seath the scaless, and occasionally the great wolf sif.

http://darksoulswiki.wikispaces.com/Guide+to+Co-operative+Play

This is our wiki's very own fantastic guide to Co-op. It has everything you need about co-op from soul levels, action and right down to where the best spots to summon It's essential reading!

Thanks for the info all, i'll go have a read up without delay.