Compared with many other tools it's quite simple to start with Qlik especially if the datamodels are simple with only one/two tables. But this advance even increased if the requirements became more complex.
It's already possible with only little know-how to develop quite sophisticated data-models. Basis is the associative data-model from Qlik whereby all tables will be connected through key-fields whereby synthetic keys and circular references should be avoided. Thoughts about star- vs. snowflake-sheme, normalization and so on can be widelyemployedback - it's easier as it looks like:
If data don't be loaded from databases else from flat-files they have often problematic data-structures including the lack of data. Beside the following links is the inbuilt file-wizard from QlikView a powerful but not well documented tool - helpful is here the book: QlikView 11 for Developers which is in general very much recommended: