I have an idea for an application, but I can't handle the coding myself. I am looking for people or companies that provide Stellar Development Services and can help with implementation. Is there anyone who has already used such services and can tell me how it works?

If you are looking for someone to help you with Stellar, there are specialists who provide Stellar Development Services. On the website, you can see what exactly they do - from smart contracts to integration with blockchain applications. There are examples of projects and contact details so you can discuss your options. All information is available here