making a shop

[SyLaTAC]

ok im making a pizza shop and i need to figure out how to make an item that will work online all i have for it like all that i know is

NPC Code:

---

if (playerchats && strequals(#c,buy single)) {

  if (playerrupees <=7) {

    message you dont have enough money;

  }

  if (playerrupees >=7){

    message Thank you!;

  }

  

  

} {

---

thats all i have because i cant figure out how to make it
1) an item that does stuff
2) go into your inventory and take gralats away

will someone help me please?