beginer in coding NEED HELP!

#define MAXCHARS 15
char myString[15]

int kelvinTemperature(celcius)
Temp=Temp + 273.15;
void setup()
{
Serial.begin(9600);
Serial.println ("number in degrees celsius");
}

void loop() {
If(Serial.available() > 0){
long bufferCount;
long ;Temp
char myData[MAXCHARS+1];
bufferCount = ReadLine(myData);
temp= atoi(myData);
Serial.print("Temp in kelvin");

this is what i have im putting in what is in the book and trying to convert it to do what the project asks for me to do. i know i have most of it out of place. and i know i have to define temp but am unsure how to go about doing it. this all really baffles me.