Small is a relative term. But since most factory-direct orders to China are above 10,000 USD per shipment, and assuming you are under that threshold, then unfortunately, I am afraid to tell you, from my experience, it is very rare to get 60 or 90 day credit terms on first orders. However, if you start small and pay on time, it is realistic that you can move to preferential terms on future orders.
Here are some links to related blog posts at CSIC the subject of supplier payments.
Let me know how things work out for you.
Mike Bellamy is an Advisory Board Member & Featured Blogger at the not-for-profit China Sourcing Information Center. He is also the author of "The Essential Reference Guide to China Sourcing" and founder of PassageMaker Sourcing Solutions.