Welcome to Librarium Online!
Starting a new warriors of chaos army and am completely new to the game in general. Heres the list and please help!
Chaos Scorcerer (205 pts)
-Mark of Tzeentch
x19 Chaos Warriors (382 pts)
-Mark of Nurgle
x20 Marauders (80 pts)
x11 Warhounds (66 pts)
x6 Chaos Knights (310 pts)
-Mark of Khorne
Hellcannon (205 pts)
Total: 1248 points
Any comments would be really helpful!
The witch stands before you now, Burning in demon light, Condemned to serve the black, It cares now for your cries, You fall before it now, Grovel with your last breath, Your god can't save your soul, GAZE INTO THE FACE OF DEATH! Armies: Lizardmen/Cryx
Sorcerer Level 2 
Spell Familiar [you are already +3 to cast]
Golden Eye of Tzeentch
Charmed Shield [for a cannonball or a miscast early on]
Bloodcurdling Roar [this is handy on fliers who don't want to get into CC]
Fewer warriors [MoT/shields/Musican/standard/Gleaming_Penant] & more marauders [MoK/Flails/Musician/Banner]
2x5 warhounds is good enough
5 nude Chaos Knights with MoK is enough - extra points can to into Core units I think.
Hellcanon - I just wish I owned one too.
Just be aware that you are leaving your warriors a bit vulnerable to magic and marauders need to be wide as possible during the first charge.
The sorcerer should do well, and spam roar on his solo monsters or knights. +3 to cast and 3 spells, he will be good at magic and tough to shoot down!
Sona si Latine loqueris.
Dont understand how you have a magic item ie "Filth Mace" in the unit of warriors. I would also drop a knight, a warhound, the banner on the knights and the champions and increase the marauder units size and I would take either great wpns for them or flails (Mok) or hnd wpn/shield (MoT).