Need help with ATtiny85 code

Question

I am looking for help with ATtiny85 coding. The project I am working on is using an Arduino Nano and I want to switch to an ATtiny85.

The code below works with the Nano but not with the ATtiny85. I am relatively new to Arduinos and have done a few projects with success but this is my first time using an ATtiny.

I will try to explain. When the code is running on a Nano

• It is checking for a number between 1 and 32 in the EEPROM at address 0.
• If the number is outside either value it will generate a random number between 18 and 32.
• I then check to see if the value at address 0 in the EEPROM is less than or equal to 0, if not it will decrement that value and store the new value in address 0.
• Once the value is at 0 or less a separate value is generated for a time delay.
• Once that time delay has occurred pin 7 outputs power for 1 second and stops.
• Once that has occurred a new random number is generated and stored in address 0.
• To decrement the value the Nano is powered off and on again and the check is made.

I have tested this code with a Nano multiple times and with pin 7 connected to an led it turns on and off, resets and begins again. When I load this code onto an ATtiny85 and run the same test the led will not turn on, also I get an error with the Serial.begin(9600) and anything else starting with Serial, so I comment them out and it compiles and uploads just fine. I have the Spark Fun AVR programmer and was able to get the ATtiny to blink an led using a simple led blink sketch but that's as far as I got. I need some help.

    #include <EEPROM.h>  // Include the EEPROM library
void setup() {
  Serial.begin(9600);          // Initialize the serial communication
  pinMode(7, OUTPUT);          // Use digital pin 7 as output
  randomSeed(analogRead(0));   // Seed the random number generator with a random value
  int value = EEPROM.read(0);  // Read the value stored in EEPROM address 0

  if (value &lt;= -1 || value &gt; 32) {  // If the value is not between 1 and 32
    int new_Value = random(18, 32);  // Generate a new random number between 18 and 32
    EEPROM.write(0, new_Value);    // Store the new value in EEPROM address 0
    Serial.println(&quot;Generated a new random number: &quot; + String(new_Value));
  }

  else if (value &lt;= 0) {     // Check if the random value is less than or equal to 0
    value--;                 // If no then decrement the value
    EEPROM.write(0, value);  // Write the new value to EEPROM address 0
    Serial.println(&quot;Random number from EEPROM: &quot; + String(value));
  }

  else {
    int time_delay = random(1, 25);  // Generate random number for time delay
    Serial.println(&quot;Generated Time Delay: &quot; + String(time_delay));

    delay(1000 * time_delay);

    digitalWrite(7, HIGH);
    delay(1000);
    digitalWrite(7, LOW);

    int new_Value = random(18, 32);  // Generate new random day value
    EEPROM.write(0, new_Value);    // Write new value to EEPROM address 0
    Serial.println(&quot;Generated a new random number: &quot; + String(new_Value));
  }
}
void loop() {
}

Sketch used for LED blink

    void setup() {    
      pinMode(0, OUTPUT);
    }
void loop() {
  digitalWrite(0, HIGH);   
  delay(5000);                      
  digitalWrite(0, LOW);  
  delay(5000);