You can make the Posts however you want but I'd recomend it like that.

Title: OFFER| Dooninum, Alum, Grav. Comp, Durasteel

Planet: Illum

 

Resource: Dooninum: 1B
Price: 2 SC for 10

Resource: Alum: 200k
Price: 1 SC

Resource: Grav. Comp: 10k
Price: 1000 SC

Resource: Durasteel: 1M
Price: 4 SC

Contact: Grand Master CHR!S (Ingame CHR!S)

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Second Version:

Title: OFFER| multiple Resources

Planet: 

Resources to sell:
- Dooninum for 0,1 SC 
- Durasteel for 1 SC
- Guerrerite for 2 SC

Contact: Grand Master CHR!S (Ingame CHR!S)

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Title: OFFER| 

Planet: 

 

Resource:
Price:

Resource:
Price:

Resource:
Price:

 

Contact: 

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Second Version:

Title: OFFER| 

Planet: 

Resources to sell:
-
-
-
-
-

Contact: