Hi Poovizhi and welcome!
I can answer your first question concerning Excel files. Yes, you can. I would recommend Libreoffice for this. No complicated drivers, indeed no uncomplicated drivers, no drivers at all are required. I've used Libreoffice's scalc on some fairly major projects and had really excellent results with it.
Photoshop is legendary as software with no absolute equivalent in Linux. I would suggest you look here
or at other similar sites for possible alternatives. How satisfactory they are depends on the nature of the work you're doing.