Hey Lunita welcome!
Riding indoors can be fun but just stepping out the door and riding in the sun and wind just feels so good. In my opinion, you should give it a shot, especially with a local group to start. If you have a local group ride, try to join it, especially if they have beginners rides. They are really helpful, encouraging, and make riding outdoors even more fun.
As for shoes, I think anybody who started riding with clipless had the worry of falling over and honestly, it is bound to happen. My advice: if you do go clipless on your outdoor bike, practice clipping in and out either in a trainer or in an empty parking lot or vacant part of a local trail. Key: stay calm, don't freak out and if you find your not clipping out, just pedal foward. As for spinning shoes, I don't spin, so I can't help ya there.
Hope all goes well and have a great ride!