Begin by setting up your Kafka environment. Ensure that Kafka is installed and running on your server. You will need to start both the Zookeeper server and the Kafka broker. Use the following commands:
```
bin/zookeeper-server-start.sh config/zookeeper.properties
bin/kafka-server-start.sh config/server.properties
```

Create a Kafka topic where you will send the data from ClickHouse. This can be done using the Kafka command-line tool. For example:
```
bin/kafka-topics.sh --create --topic clickhouse_data --bootstrap-server localhost:9092 --partitions 1 --replication-factor 1
```

Prepare the data in ClickHouse that you want to export. Use SQL queries to filter and select the necessary data. If needed, transform the data within ClickHouse to match the expected format in Kafka.

Export the prepared data from ClickHouse to a file. This can be done using ClickHouse's native command-line client by executing a SELECT query and redirecting the output to a file:
```
clickhouse-client --query="SELECT * FROM your_table FORMAT CSV" > /path/to/exported_data.csv
```
Ensure the data format is compatible with Kafka consumers, commonly CSV or JSON.

Write a simple Kafka producer script to read the exported data file and send each line as a message to the Kafka topic. You can use Python, Java, or any language with Kafka client libraries. Here's a basic example in Python:
```python
from kafka import KafkaProducer
producer = KafkaProducer(bootstrap_servers='localhost:9092')
with open('/path/to/exported_data.csv', 'r') as file:
for line in file:
producer.send('clickhouse_data', value=line.encode('utf-8'))
producer.close()
```

Run the Kafka producer script to read the data file and publish messages to the Kafka topic. Monitor the script's execution to ensure all data is correctly sent to Kafka.

Finally, verify that the data has been successfully moved to Kafka by consuming messages from the topic. Use the Kafka console consumer tool to check:
```
bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic clickhouse_data --from-beginning
```
Confirm that the data appears as expected in the console output.
This guide should help you move data from ClickHouse to Kafka using native tools and scripts, without relying on third-party connectors or integrations.