Will you be the top, bottom, or will you be versatile?
From a bottom perspective, buy a regular-sized
Dildo and a medium-sized buttplug. You will need some lube too.
Start with playing with your ass with your fingers. Finger fuck yourself with one, then two, then three fingers. This may take some time (days/weeks) getting comfortable with this.
Then substitute the
Dildo for your fingers. Fuck yourself as hard as you can withstand because some tops really like to pound hard. This will give you an indication of how much intensity you can withstand.
This will also inform you if you need to douche before bottoming. If there is poop on the
Dildo go douche. You can purchase Fleet enemas for a few dollars at Walmart and most drug stores.
Begin wearing the buttplug a few minutes each day until you can wear it for about two hours comfortably. This will train your ass to accept a cock and diminish that need-to-poop feeling when you are being penetrated.
You will be nervous when you hook up with a guy, this is normal. Take deep breaths and try to relax. Concentrate on the top and how hot he is to you. Once you get started, all the nervousness will subside.
It is best to get a top with some experience. There is more to fucking than just sticking your dick into a hole and start pounding. An experienced top will know how to prep you to get as much enjoyment out of it as he gets. Sex is a wonderful experience when both participants enjoy the experience.
Always use condoms when hooking up with a guy, even if he says he is clean or HIV negative. Guys lie and most just don't know their true status. Protect yourself, demand condoms to be used or walk away. I hope this helps.