Yeah, try with a dildo first.
A dildo is obviously nothing like the real thing.
But you will know physically what it will feel like having something inside of you. Ejaculating with something inside of you is intense.
We are not women so we do not have orgasms the way women have orgasms. I am a total bottom and very submissive, anal sex is more emotional to me. Having a man inside me is so intense. I love it. To allow a man to enter and penetrate me, to be so intimate physically with another man, its an incredible feeling.
If you look in this forum, there's alot of great advice. Some men do not like to be touched while bottoming. I do not mind, actually I love it when my top jacks me off while plowing me.
Hope your top is gentle with you for your first time.