Welcome!
Beagles are great dogs. And that is one very nice thought you have, But dogs don't really keep eachother busy & excersize eachother too much. If your one dog is lonely & bored most likely when you get another you will just have 2 bored & lonely dogs.
You need to be able to properly care for one dog before you should add another.
2 dogs is just that, double everything that one dog needs.

And as far as breeding goes please reconsider all the possibilities. Geet knowledge, speek with vets, breeders trainers to get as much input as possible. I could go on & on & on & on about all the pros & cons on breeding, unfortunatly there are many more cons than pros. There are tons of dogs in need of homes in shelters & rescue organizations, why add to that population? What if you don't get a lemon color? What if you encounter complications and no puppies live?

The ONLY reason to breed is to improve the breed, therefore both parents should have history on them & should be at least 2 years of age, UTD on all vaccines, tested for & free of all health problems, meat the breed requirements etc...

please reconsider breeding & also make sure your time, space & budget can accomidate twice as much as what you have now.

Good luck