I was wondering whether it would be possible to make a bot that would send a message to an existing list of twitter users. If it is possible, then what coding language should i use and how would i even start? I have access to twitter api if that helps.
For that you will need to use your Twitter API keys. I think the most common way to code a Twitter bot is to do it in Python. Here's a good tutorial https://realpython.com/twitter-bot-python-tweepy/
Hope it'll help you :)