No
NO
you can start a senetence with or but it wont be proper grammer.
Yes, sure.
You did a proper job of it.
It's perfectly fine to start a sentence with likewise, just make sure you have a comma after it.
Yes, "Hiking" should start with a capital letter in a sentence because it is a proper noun.
No, a sentence can begin with any kind of word. The first letter of a sentence is always capitalized to mark the start of the individual sentence, not because the word is a proper noun.
Yes.
Only if its plural, like conclusions.
No, because "and" is a conjunction, which is a word that puts together phrases and clauses to create a sentence.
Less frequently but i wouldn't. its not proper, i guess to say.