i use tampax usually, although all brands are pretty much the same. the size you get will depend on your flow, if it seems like a lot then get super, if it seems medium get regular, and if it’s light get light. but i would suggest you get a box of light ones in addition to whatever size u get, one so you can practice putting it in with a smaller size which will be easier, and two because those are better on the later days when you’re not bleeding as much