Transport request & Z Developments

Hello Experts,

I Need clarification on the below topics please can some one summarize in detail.

1. How to create transport request and release form Dev to QAS?

2. What is Z developments when we create this tables?

3. Development system client: Golden Master Client, Unit test client, Development Client, sandbox client

4. Quality system clients: Backup golden client, integration test client, user training client, user testing client.

Please provide your valuable points.

Thanks in advance.

Prasad