I'm relatively new to TeX, which means I did nothing more than homework and some math things with it.
Now I'd like to write invoices with LaTeX (for reusability etc.)
I am not searching for a template.
What I'm looking for is actually more a starting point and maybe some resources that already helped other people to get started with writing invoices or similar kinds of documents.
Where should I start in order to learn to write more complex documents with LaTeX? What helped you?