Hi Girasole,
We have written a few blog posts which might help you out with getting started:
Other than these two, our "Apps" section on Europeana Labs might have some relevant information for you such as client libraries in various languages and (opensource) applications created by others using the Europeana API:
These guides/references along with the general API documentation and API console might be just the package of information you need to get started.
If you need any help along the way, feel free to reach out.
Regards,
Remy Gardien
Europeana