As you may know, a suite is actually stored as a folder on disk. The suite folder contains subfolders for Scripts, Images, and Results. I would suggest that you add another subfolder called Data, containing your data files.
Then, to access the files you’ll need a way to find the Data folder from a script. A script can access the folder it’s in (the Scripts subfolder of the suite) as “my folder”. Then the suite itself is “my folder’s folder”. So to read a data file from your Data folder you could do this:
set dataFolder to my folder's folder & "Data/"
set dataFilePath to dataFolder & "DataFileName"
put file dataFilePath into myData
I hope that helps.