Hi Ami. No I think the most important thing is actually travelling. When you experience new things, you may naturally feel like sharing them. Writing your experiences is a great idea and you can start by documenting any past experiences you've had.
Hey Ami,
Happy about your travel adventure. Traveling is for the soul, and mostly people write their travel stories by blogging as it is an awesome way to share your adventure with other fellow travellers and inspire others to explore. And its not compulsory to blog its on ones personal comfort level.
Hope this answered your question.
Happy travelling.
Hey Ami
It's not quite necessary to write travel blogs. You can also publish photoblog. And if you are writing a travel blog then you can write about your past trips.