How do indie developers go about setting up alpha testing?

Hello, I have a game I've been making and in the next month I want to have a closed group of some people I know test the game in its early stages to find things and give feedback as I continue developing it. I'm wondering the best way to go about it, it is a PC game. Do I try and do it though steam? Is there another way I can post up the game files for them to download? Any pointers would be greatly appreciated.

 

look into Steam Playtest.

If you havent setup store page yet you have to distribute keys, but if you have store page already setup you can open it to public.

Of course you can zip built project and upload google drive or where ever.