The following suggestions are based on all medium hive boxes (6 5/8 honey supers), 10 frames foundationless beekeeping.
Why all mediums? I find it that it keeps things simple to have only one size box to worry about and the mediums are easier to move and work with. The answer on why go foundationless is more difficult. For me it was it just made sense to let the bees do what comes natural to them, versus forcing the build their home on plastic. More info on this subject read Michael Bushes website.
Where to buy?
I prefer to buy my beekeeping equipment at Mann Lake. They have a distribution location in California, which means most items arrive within a couple of days and they offer FREE shipping on orders above $100. I had never an issue with any order I placed and I'm happy with the quality of the equipment.
If you do want to go with a different vendor, more power to you, the below are simply suggestions.
The hive body and frames
One 10 Frame Bottom Board/Reducer - order
Five 6⅝ 10 Frame Unassembled Budget Grade Super Each - order
Five 6 1/4" Unassembled Select Frames - Groove Top & Groove Bottom - Case of 10 - order
One 10 Frame Assembled Telescoping Cover With Inner - order
One Pound 7D Nails (for hive body assembly) - order
One Pound 1 1/4 Nails (for frames assembly) - order
All other essentials
One BeeSuite - Start your search here, pick what you feel is best for you.
One pair of Gloves - Start your search here, pick what you feel is best for you.
One Hive tool - order
One Smoker - order
Buying the Girls
there are many places that sell bees. Here are just my suggestions for North California.
Olivarez Honey Bees
Hope this helps. Please let me know if you have any question in the comment section.