My first rookie mistake was something similar. In my introduction post about 3 days ago I choose the 100% option instead of going 50-50. I didn’t knew nothing about Steem dollars at the time.
But either way, I am happy to have found this community and excited to take part in this!
Read the FAQ, it's the first thing everyone should be doing when they join any platform. You'll find a lot of information to get you going :)