"I've some files on words process "wps" changed to text txt, csv .Can I open the txt on the mac now?"
Is that a word processor file created with Microsoft Works?
If so, does the file contain just text, or are there graphics in it, too?
If text only, you can export as a "text file".
If there are graphics, perhaps it can be exported as "rich text".
On the Mac, it might be possible to use the free "LibreOffice" to open the original (unconverted) files. I can't confirm that because I don't have a source file with which to try it.
Do you have a sample file you could post here, that we could download and work with?
Really, stop worrying.
File conversion is quite "do-able" from PC to Mac in many cases.
You will want to keep the PC up-and-running for at least a few months after you get a Mac, so if you run into any problems, you can still "go back" until those problems have been worked out.