My insert list (the number of inserts on the pf, not amount I ordered) :
1) Pink - 9 #555 1SMDT10PFT (purple)
2) Red - 18 #555 1SMDT10RFT
3) Blue - 6 #555 1SMDT10BFT and Ice Blue #555 1SMDT10IBFT and Ice Blue #44 1SMDT10IBFT bayonet
4) Green - 7 #555 1SMDT10GFT and #44 1SMDBA49SGFT bayonet
5) Orange - 7 #555 1SMDT10AFT
6) Yellow - 10 or 12 #555 1SMDT10YFT
7) White - 0 or 2
I bought insert bulbs Comet P/N example for Red 1SMDT10RFT, these are #555 (wedge) frosted. #44 is a bayonet bulb. I bought all frosted.
I bought a 25 pack 5050 frosted warm white #44 bayonet. 1SMDBA49SWWFT
I bought a 25 pack 5050 frosted natural white #555 wedge. 1SMDT10NWFT
I bought a 25 pack 5050 frosted warm white #555 wedge. 1SMDT10WWFT
Most people leave backbox bulbs as incandescent, but here's my misc bulbs list as well:
Twin 2835 frosted Red #555 wedge. 2SMD2835T10RFT (ordered 4)
Twin 2835 frosted Warm White #555 wedge. 2SMD2835T10WWFT (ordered 10)
2 SMD Fluted Dome Warm White #44 bayonet. 2SMDBA9SWWFD (ordered 13)
5 SMD 5050 Tower #906 Warm White (flashers) wedge. 5SMDFLASHT10WW (ordered 12)
8 SMD #906 FLASHER Warm White wedge. 8SMDT15WEDGEWW (ordered 2)
OPTIX MAXIMUS Sunlight White #44 bayonet. OPMAXBA9SS (ordered 4)
OPTIX MAXIMUS Sunlight White #555 wedge. OPMAXT10S (ordered 4)
Order total was about $150. OldPinGuy suggested using Sunlight White so I bought some and the OPMAX as options, along with higher SMD flasher to install and see if I liked them but for me the default was 1SMD Warm Whites and color matched inserts. Some people suggested 2SMD so I bought a few to test with to see if I liked them.
So in short, the misc list you don't have to order. Decide if you want color matched inserts, 2SMD or 1 SMD, Warm White or Sunlight White for GI and flasher brightness on the playfield and whether to use LEDs or incandy in the backbox for flashers. You probably don't need 3 25 packs of GI bulbs like I ordered, maybe only 2 needed, but they are only $16.25 per pack and I wanted to experiment with different GI whites.
Good Luck. Some suppliers might sell pre-packaged LED kits as an option to this.