Need tips on my team

[sweetsurrender]

It's the first time I've played fantasy NBA and it's been a choas so far.... I've been always at the bottom of the leage
and I have no clue what to do now. My rosters consists of

-Chris Paul
- Carlos Boozer
-Brandon Roy
-Rasheed Wallace
- Rip Hamilton
- Tayshaun Prince
-Shawn Marion
- Richard Jefferson
- OJ Mayo
- Andre Iguodala
-Jermaine O'Neal
-Paul Millsap
-Corey Maggette
-Monta Ellis

and yes I'm lacking a pure center. Please, please, please give me some advice! Scoring format is Rotisserie

(Team A)
Baron Davis
Vince Carter
Kobe Bryant
Caron Butler
Kenyon Martin
Kevin Garnett
Pau Gasol
Brad Miller
Andrei Kirilenko
Chris Duhon
Mike Bibby
Rashard Lewis
LaMarcus Aldridge
Zydrunas Ilgauskas

(Team B)
Deron Williams
Mike Miller
Andre Miller
Stephen Jackson
Tim Duncan
Zach Randolph
Greg Oden
Chris Kaman
Rudy Gay
LeBron James
Tracy McGrady
Gerald Wallace
Josh Howard
Peja Stojakovic

(Team C)
Allen Iverson
John Salmons
Ray Allen
Paul Pierce
Elton Brand
Ron Artest
Tyson Chandler
Al Harrington
Lamar Odom
Dwyane Wade
Yao Ming
Jason Terry
Tony Parker
Rudy Fernandez

(Team C)
Derrick Rose
Kevin Durant
Jason Kidd
Antawn Jamison
David Lee
David West
Al Jefferson
Nene Hilario
Shaquille O'Neal
Jose Calderon
Andrew Bogut
Dwight Howard
Devin Harris
Manu Ginobili

(Team D)
T.J. Ford
Nate Robinson
Steve Nash
Hedo Turkoglu
Troy Murphy
Danny Granger
Mehmet Okur
Amare Stoudemire
Josh Smith
Jason Richardson
Chauncey Billups
Dirk Nowitzki
Spencer Hawes
Andris Biedrins

(Team E)
Jamal Crawford
Michael Redd
Ben Gordon
Al Thornton
Marcus Camby
Carmelo Anthony
Chris Bosh
Samuel Dalembert
Andrew Bynum
Kevin Martin
Joe Johnson
Mo Williams
Michael Beasley
Roger Mason