In your opinion, is it often a better fit for an unknown novelist to sign with a newbie agent at an established agency or with a veteran agent.
I've been signed with a veteran before. My novel didn't sell and I got lost in the shuffle of her more lucrative clients.
But how does a newbie agent at an established agency send mss to editors? Do they even know editors?
Yes, they know editors. And if they work in an established agency they have access to the collective brain of the people who work there. And they have the name of the agency to open the door.
"Hi this is Newbie Doobie-Do at ICM" is a phone call that gets answered.
I think you should sign with an agent who loves your work, and has red hot enthusiasm for it and a couple of good ideas on where to send it and can hardly wait to get started. Age and experience are helpful but there's not a lot that beats excitement and willingness to work.