So Simple Ideas
Choose the right journal. There are many different types of journals available, so find one that best suits your needs.
Set a schedule for writing in your journal. Decide how often you want to do so and stick to it!
Make journaling a daily habit by timing yourself. Instead of thinking about journaling in terms of long stretches of time, build a habit around shorter periods.
Create a list of prompts that make you think, and use them to spark your creativity.
Pretend that you have an audience. You can address the journal to anyone you know, including yourself!
Keep your journal with you throughout the day. The best way to get used to journaling is to keep a journal close at hand, and write in it whenever you feel like it.