Taking Natural Phenomenon photos is allot easier than people make you think.  I have a Canon Power Shot and my son has a Samsung SL30.  Two very different cameras.  One with allot of bells and whistles one a basic but nice camera.  Both take excellent phenomenon photos.  I usually keep my camera on high speed photography with no flash.  My son uses a flash on a landscape setting.  Still very different photographers.  So why am I telling you this...well I want you to see it doesn't matter what type of camera that you have or how you take the picture. Just make sure your lens is clean, spots on the lens can look like orbs.
One thing I will say, take lots of pictures.  Not just one but I let my shutter click about twenty times.  Within that twenty I will get maybe three really good photographs.  That's not to say that there isn't some activity going on in more than the three but three that you can say there is absolutely something in them.
I also suggest not to delete anything until you see it on your computer or a larger screen.  I have taken photos and thought nothing was on them until I put them on the computer, and was amazed by what I saw. 
Don't lock yourself into one place or one subject to photograph but if a place is giving you good photos stick with it.  Outside my dinning room window is one and another is the hallway.  But I have gotten many at other places as well. Go for a hike at a State park, they are usually at some sort of old military camp or mill or something with history.  I have gotten some great orbs at our local State park.
When you look over your photographs its always good to have another set of eyes.  Sometimes I get stuck on looking for one thing and will miss an Orb in the corner.
Lastly have fun with this, you don't have to be quite to be honest I find I get better photos when my children are playing and laughing.  I think the spirit energy likes the laughter of children...but don't we all.