The biggest suggestion I have is to pin point the top 5 services you'd like to subcontract to others. I found without a focus I was spinning my wheels.
There are now companies that match VAs to other service providers. Remember that a VA is a service provider so they do look at finding subcontractors from some of those sites as well. Create a profile in related VA forums such as this one marketing those services.
One last thing, is that there are a lot of mentor programs. Some of the programs don't pay you for your work. The good thng is a mentor gives you the hands on experience and teach how to provide a service at the same time.
Also
this thread might help you with your question.