Pretty much the only step is picking a device - do you just want a little stick for testing or making a repeating station, or would you rather have a more standalone device with a big (relatively) screen and maybe a keyboard? Do you want/need GPS? Consider how you’re going to power it - pro tip, discarded “single use” vapes are a great source of small rechargeable LiPos. Both Heltec and LilyGo are good choices with regards to reliability and compatibility. Go on their websites and get an idea of what’s out there, then pick one and you’ll be up and meshing the same day you receive it!