Anal?

so my boyfriend's wants to try anal when we get married he wants to start off with just fingure and no toys!!

I wanna try a small butt plug so I can at least get used to it but I wanna know how else I can prepare to get a dick in my butt - do I eat or drink something to clear my insides do I need condoms I know I need lots a lube but I'm not sure how else to prepare