With my 8x10 camera I bought a 14" Kodak Commercial Ektar as my first lens. A 14" is considered a "normal" lens for 8x10. I was in a hurry to try out 8x10 and actually overpaid for this lens but it was the exact lens that I wanted.
While trying to decide on what I wanted for a second lens (longer or shorter), a Fujinon 250mm f/6.7 lens came up on Ebay at a great price so I bought it. A 250mm is a slight wide angle and on 8x10 similar to a 35mm lens on a 35mm camera. For my next lens I wanted longer and watched for a 19" Artar at a good price. A 121mm Super Angulon became available for dirt cheap so I bought it. The 121 is super wide and just barely covers 8x10. After months of watching, I finally found my 19" Artar for a good price so I'm very happy with what I have.
So to answer your question, after over paying for my "normal" lens, I took my time on my additional lenses and bought them in the order that I found them at good prices.