Ok I think this is what you want.
You want a script to do the search, delete the file and create a log of it. It might can be done a little simpler but I can make it work with a couple of commands and a script.
First you want to capture the output of your search into a file
Code:
find -size +10M -mtime +90 > files
Then you need a script to parse the file, delete, and log the files.
Code:
#!/bin/sh
while read files
do
rm -f $files
echo " "$files" deleted "$(date +%Y$m$d)" " >> filelog
done
Then you need to execute the script telling it to parse the files file.
You could create another script that would run just the two commands you need and set it up as a cron job to run daily.
Code:
#!/bin/sh
find -size +10M -mtime +90 > files
./filedel < files
done
Just don't forget to make your scripts executable
Code:
chmod +x scriptname