Soooo....butt plugs

So i want to experience with anal sex but i don’t want to rush into it. My boyfriend and i have had this conversation so many times and i’m all for pleasing my partner but i just want to try new things and explore. i’m comfortable with the idea i’m just not sure what products to get. I do have water based lube i’m not sure if that’s good or not but that’s why i’m on here asking :) i do have to say i am of the age of consent and my partner and i do have safe words in case anything goes down hill. I really want to get butt plugs but i’m just not sure if i should get a metal one or silicone. so i’m asking you guys because google isn’t so helpful. please let me know if you guys have any preferred sex toys that would be good for me? i do have to stay i have NEVER done anal before or let alone had anything...go up there..so i want to start small :) please no judgement ): let me know what yoivguys think and drop some helpful tips pleeeease