CraftingStudio:
when I connect the module to any apps it works and the light stops blinking
Al that does is prove the connection between Android and Bluetooth. There may still be procedural problems, between Bluetooth and Arduino - some dumb mistake you will only make once.
Your code cannot use serial monitor, the Serial.print should just be regurgitation back to Android and you just get to watch with the monitor.
You might find the following background notes useful
http://homepages.ihug.com.au/~npyner/Arduino/GUIDE_2BT.pdf
http://homepages.ihug.com.au/~npyner/Arduino/BT_2_WAY.ino