You have to set your goals and expectations first. The Hide calls ELR "Beyond 1000 Yards". Most of the members of this sub-forum shoot at much longer distances than 1K. For many folks, a mile is a convenient first goal, in part because it does not require a competition quality ELR rifle, which is expensive. You have to make a spend plan that couples logically to your shooting goals. There are lower cost options, but if money is not an issue for you, I'd point you at the "buy once, cry once" approach. Do you plan to compete? Competing would drive you towards a reasonably powerful cartridge choice and I'd recommend a high quality optic.
You can start by exploring the limitations of rifles you already own. Stretch them out to their limits and make mods such as optics and mounts that allow you to shoot longer. Get a decent spotting scope and a partner with similar goals. You can look for facilities that teach ELR classes and possibly save quite a bit of time to get into the zone. But you will still need to set goals and expectations first.