For importing excel based requirements/parsing the files, you can either use the 'ExcelImporter' app store module and try to implement that or you could try creating your own Java actions that can do the parsing of the .xls files.
If you're looking for some help with styling/creating the system from someone else, this seems like a hefty job so you may need to look into a Mendix partner and getting a quote and do some requirements gathering.
Cheers,
Harry