Well man, hard to work out a list from what you got.
 But you'll end up at 650p like this.
 3warbikers one a nob with Boss pole / power klaw
 20 shoota boyz, with 1 big shoota & Nob: 
bp/
pk
 take 5 clean nobz with ghazkull into a trukk with Red paint job and reinforced ram.
 
 But i would have to consider a normal warboss or a big mek for you, considering Ghazzkul is only good for BIG lists like 1,5k 2k and higher up.but what you got is a start of a speed list wich can work out for you. focus on some more boyz first and get about two loota/burna boxes and get some lootas out of it, D3 hits with 
str 7 
ap 4 on a 48 inch range is awesome! 

 but welcome to the green side!