Your heart will love you for this. Starting regular exercise will clean out your entire circulatory system, making your heart's job a lot easier.

That said, your body may not be up for 50 miles/day right off the bat. You might find your various organ systems screaming for mercy at first. You might have to sneak up on it a little bit. That's all right. It won't take long.

Route makes all the difference. If the ride seems harrowing, look for an alternate route. It is unlikely that the best cycling route will correspond to the best driving route, depends on where you live though. Have fun.

I don't think it's unreasonable to take a little food on a 25-mile ride, but it shouldn't be necessary if you are sufficiently fueled to begin with.

Robert