maybe the labels, who already exists have better connections to artists u know, but there are a lot of unknown artists (filthy dub step, deep dub step etc.) to find on sound cloud. u don't need famous names, u need good producers!!
check guys like Droptek or Merakisurgery....NoMan, Scalp, Submask ...... etc etc
unsigned dudes with awesome skills!
or maybe you check some clubland producers (Killshot)
(maybe me in the future
I'm working on it!
imo its always good if a label can offer a mastering, so u need a good guy for mastering!
keep it up, your idea is very good! I'm glad to see there are people, who are able to start this.. and take your time
Quantity < Quality
And its always good to work together with other labels, so if you have your base and artists contact falcon records or amorpha for features etc.