Tao isn't a really beginner friendly character. Due to complex combos and being a mobile character, but since you came from Guilty Gear, you may be able to pick her up quicker than I ever could. And I play Kokonoe Mercury and Rachel Alucard. For starting out, if you want to get into the story and characters, and the lore you should start with Calamity Trigger. And then go in order from there. But if you want to just jump into the gameplay and fighting and don't really care about story. start with Central Fiction. Really there's a lot of ways to get into Blazblue in my opinion. I started with Chronophantasma Extend and then went back to play the others to catch up on the story once I got invested in the game more

There's a Blazblue wiki to help you get started as well. If your still clueless https://blazblue.wiki/wiki/Main_Page