Help Request - Best scope for $300

Total newbee here - looking for either a new or refurb used high power
student scope - a couple questions if I may:

1. Generally, what should I be looking for in a scope?
2. What are the best brands?
3. What brands should I steer clear of?
4. What are the pros/cons of Binocular vs Trinocular?
5. Should I care about a camera attachment or get that later so the
money can all go toward the best scope?
6. What features are critical?
7. What accessories are critical?
8. Is ebay a good source? If not, what is the best source for price/
service?
9. What questions should I be asking prior to purchase?
10. Any other tips/hints/suggestions?

If you don't mind, please reply directly to me: cpiel AT verizon DOT
net

Thanks!!!
.

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