Questions about anal

I am very fascinated by anal masturbation. I have never tried it except with really hard objects, and I could only get it in like half an inch or one inch.Do you orgasm from anal masturbation (Using a dildo)? Do you ejaculate from it?Where can I buy a dildo without using my mom's Pay-pal? What stores sell them besides sexstores? Can you find them in suburban areas and not the inner-city (I have no car or allowance because lazy)? Do you just type in. (And it hurts too ;_; likely because I'm pushing on my prostate)How do you get a dildo to fit all the way in?What do you do about shit? I mean, yeah, clean the dildo, but what if you do the real deal? Do you just clean your dick? What about STDs? Do you have to block the urethra (penis hole)?