Having, understanding, and using approach charts is imperative for IFR operations. I recommend spending the money on Navigraph, which gives you most of the charts in the world. Bui in the absence of that, get your hands on as many free charts as you can and learn to read them. Some countries publish them for no cost other than the taxes from their citizenry.
Here’s the FAA’s take on it (warning, PDF): https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/instrument_procedures_handbook/media/faa-h-8083-16b_chapter_4.pdf