Firstly, you will need to have 5 separate, A4 sized .PNG files.
If you then go to the …\Community\justflight-aircraft-146\Data\Images\Checklist and …\Community\justflight-aircraft-146\Data\Images\Chart file directories, you should find the .PNG files of the default checklists and charts.
The simplest way of getting your documents to appear in the sim, is to give your files the exact same names as the default files, then drag and drop the new files into the folder and overwrite them when prompted. This will mean you don't have to edit the .ini file but your new files will appear in the sim under the same titles as the default files.
If you would like to change the order or titles of your files, this can be done in the 146_checklist_list.ini and 146_chart.ini files. In these .ini files, "FILENAME=" is the actual name of the file in the file directory listed in part 2. "DISPLAYNAME=" is the name that will be shown on the INDEX page in the sim for this file. "ATCINFO=0" means no ATC information will be shown at the top left corner of the page. "ATCINFO=1" means ATC information will be shown at the top left corner of the page.
If you get stuck, there are some further instructions in the top lines of .ini files that further explain each parameter.
We also have some information on how to use the interactive charts and checklists on pages 57-60 of the 146 Professional (MSFS) Operations Manual: https://downloads.justflight.com/products/JFF003642/146_Professional_MSFS_manual.pdf
I hope that helps.
Mark - Just Flight