The are lots of different pads to choose from, it can easily confusing! But just like nappies, mostly its just a matter of personal choice, and sometimes, cost!
I find bamboo velour topped pads and jersey/knit topped pads to be the most comfy. Minkee and fleece is also comfy, and sort of like a "stay dry" barrier, but I find they can feel a bit sweaty and they aren't a natural fabric to have against the skin, if thats important to you. There's also plain cotton, flannel, lycra etc, which can be cheaper but are more prone to staining or signs of wear and tear (although many women disagree!)
Inner fabrics vary, but are usually one or two layers of absorbent fabric like bamboo, hemp or cotton. Like sposies, they can be with or without wings (I prefer with wings) and can be backed with PUL, wool or fleece.
You certainly dont have to try them all (unless of course you have the budget to do so, go for it!
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) but choose some you think you'll like. around 6 pads is a good number to start with, although you'll probably need at least twice that to keep you going for a whole "flow" and be able to get them washed and dried in time. I got on well with about 8 med pads, 6 liners, 4 heavy pads and 4 night pads, which meant I usually didnt have to wash any during my flow. Then i got a mooncup and most of my pads were very lonely