They're not my favorite thing to do with my hair right now, and I'm looking for an alternative, but, braid-outs and twist-outs are definately good for transitioning.
One thing you have to remember is that the second you decide to transition, it's best to treat your hair as if it's already natural. That means wrapping it at night, doing low manipulation styles that will give your relaxed ends more texture (rather than straightening your new growth to match your ends, which could lead to excessive heat damage), etc.
There are also many great resources on the internet, hair blogs being some of my favorites. Look into popular Natural Youtubers as well (Ninapruitt, BlackOnyx77, Naptural85, 160Days2Lose2, etc.) for inspiration and help.
And, finally, congrats on your decision.
I'm not too far into my own transition, but, these were the tips that were given to me and they did me a world of good..