If you can handle Twitter you can handle Tumblr. I’ll say go for it because, from my experience, the forum community and the Tumblr community and the Reddit community are 3 different worlds.
Tumblr is a rite of passage for some of us that are starting new, it helps established a fandom and put your story out there for when it comes out for sale.
Yes, there is drama on tumblr, but there are also some lovely people.
What to expect:
A lot of anonymous ask from people that have read your stories and want to know more about the characters. Sometimes the ask are fun, deep, interesting but sometimes there will be that one Anon that just woke up on the wrong foot and just want to slide in your inbox to give you hell.
Overall, if you can handle Twitter, you can handle tumblr. Make sure to post your link on the forum first for the people to find you, and I’ll even give you a reblog 
Hope that help.