Yes, the price is a set of string and cable.

I like 452X. Though X-cell is exactly the same material from Brownell so either one is fine. It is very stable and once settled it stays that way.

Center serving - I like Crown serving from Brownell much better than I like 62 because it is extremely slick which makes for a very clean nock release from the string and is extremely durable and wear resistant. It also lays very flat and tight. I have never worn out crown serving. I haven't used Halo for center serving but I think halo is very similar to crown.

Halo or crown serving on all other servings. Though when I make my own strings I use Brownell mini serving for end loops and cam servings because ultra thin so it lays extremely tight and will not slip.

Don't worry about what diameter to use. He knows what to put where.

Honestly, just tell him what two colors you want your string and cable to be and what bow it's for and let him do the rest. You will like what you get.