You need a noun after "à la" to form a complete phrase. Here are some examples of how you can use "je" and "à la" separately in a sentence:
Using "je" (I):
* Je vais au cinéma. (I am going to the cinema.)
* Je parle à la serveuse. (I am talking to the waitress.)
* Je joue à la guitare. (I play the guitar.)
Using "à la" (to the):
* Il va à la bibliothèque. (He is going to the library.)
* Elle écrit à la plume. (She writes with the pen.)
* Je donne le livre à la professeur. (I give the book to the teacher.)
Let me know if you have any other French phrases you would like help with!