Flac frontend is quite basic and very easy to use , remember flac is lossless so no quality issues to worry about here ,
Run the program as administrator ( right click on it , then select "run as administrator" )
On the right , click "add files" ... they will all appear in the files box.
Make sure all files are highlighted , then click "decode" ... as long as all the files are in the same directory , and the "output directory" at the bottom says "<<same as input directory>>" it will put all the wav files in the same directory as the flac files.
If you like , you can put the wav files in a different folder , thats up to you.
Now open your cue sheet and check that the file names in the cue sheet match the filenames of the wav files , including the extension , sometimes cue sheets are generated with .flac extensions instead of .wav .... for burning to CD they should be .wav , if you need to edit the cue sheet , just change the filenames to match the wav filenames and it should load in EAC , if it wont load into EAC because of an error , it will tell you on what line the error is.
Once you have burnt the CD , you can delete the wav files , the flac files are left as is.
Screenshot of flac frontend here