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One quick warning Michael, be careful with Aerogard around optics. Use roll on only, put it on a few minutes before heading out and make sure none gets on eyepieces or lenses, it can quickly destroy optical coatings!
Yes you do need to keep both eyes open with the red dot finders. When I have used them or a Telrad I find it easiest to keep both eyes open looking at the area I want to point to then guide the scope over to the area rather than trying to look through the finder.
The scope you have is a fairly basic beginners refractor, not a lot of light grasp at 70mm but will give reasonable views of Jupiter, Saturn, open clusters and globs so lots to explore. It is on an Alt Az mount which makes it much easier for a beginner than an eq mount.
Malcolm
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