With a pen :)
No, You cannot use but to start a sentence.
Stealing is generally considered of great transgression of the law.
Condescension is a long word and i am putting it in to a sentence.
Example sentence - We walked quietly in the long hallway.
Example sentence - Her hair was long and silky to touch.
"I received the goods only long after they were due."
I had to wait at the railroad crossing for a long, long, very long train.
Yes, it is generally a good idea as it prevents that sentence from becoming too long. It is like a "pause" in the sentence.
The laws are on the books however they are generally not enforceable.
You can use as many commas as needed in a sentence to maintain clarity and coherence, but it is generally recommended to keep the sentence concise and avoid excessive use of commas.
You should use it generally as an adverb.Here is an example."as she walked, the tightrope wobbled dangerously"
The antenna on the ant was long