Look in your Pictures folder. Do you see a file named iPhoto Library?
If you don't, try searching via the File menu, Find ... and specify
iPhoto Library
for the name of the file (you can select name of file, or contents of file etc.).
You emptied your rtash but it doesn't make sense that you might have put the iPhoto Library file in the trash first.
When you open iPhoto, you can specify the name of the iPhoto Library file by holding down the option key when you start up iPhoto, but you have to find that iPhoto Library file first.