This is a great option since it already shows you want to start the process. My wife has a video blog that she creates two videos a week which generates about $1,500 a month for simply video taping our meal plans. Since we have an odd diet that requires working around a lot of allergies she said why not make videos about it to see if people will watch. Her question to you would be what do you enjoy doing? What would you be passionate about writing or video taping for the world to see? Are you comfortable with negative people responding to your posts ? Once you have these questions answered start the process to build a base. Then learn how to gain traction through trends, hashtags, etc that will bring people to your page. It took several months of her doing content with little responses so be comfortable with a slow process. It's fun and make sure you enjoy what you're blogging!
- wordpress.com (but there is a small learning curve that can be readily supplemented by tutorial books normally available at a local public library)
- blogspot.com (sponsored by Google, often called 'blogger') land is easier to start with. A sample tutorial on getting started is at https://www.howtogeek.com/514162/how-to-start-a-blog-using-google-blogger/
But blogs are no guarantee of anything. If you want to get a lot of viewers, you will need to promote the blog and spend some time studying how search engines locate and promote websites. Also - most important - if one of your goals is attracting college admissions officers - you need to ensure the content is substantive and portrays you and your views to your advantage. Good luck. Blogging is fun, and I've been doing it for over a decade.
Blogs are personal, so keep in mind this general statement, that is to write what you know. You can take your blog in any direction but don’t be afraid to start with writing about a topic that is personal, passionate, interesting to you… you want people to enjoy what you are writing and they do that by relating to topic or words. So start there and then you can absolutely take on other subjects you might not be as familiar with but want to learn more about. So you could make a blog specific to wanting to know more about a topic and why you want to learn more. Little things like that make a difference when you start writing but also make a difference to anyone reading your words. Best of luck.