For the white/green split-colour circle, solvers in North America can probably just ignore the white half, while solvers elsewhere can probably ignore the green half. For the purple/brown one, young solvers can probably just ignore the purple half, while older solvers can probably ignore the brown half. Line 5 might be easier like this:

Not everything you'll extract is a letter.

You need to convert colours into letters, into numbers, into colours to complete the circle. Line 3 might be easier rendered like this:

Extract the message and look up the catalogue number indicated by the purple boxes. Here are all the lines made a bit easier: