You can start a sentence with "Also"
On the other hand,
you can use ..."is" "am" ... it really depends on the content of the sentence ...
You can use however instead.
You use it similarly to "except." Example: we drank just about every beverage other than milk.
You can just about use any word possible to start a sentence
No, You cannot use but to start a sentence.
Yep. There's no problem with using 'an' anywhere you want to. You shouldn't use and at the start of a sentence, though.
He misjudged her and was sorry. To have misjudged her was wrong. This is misjudged and five other words. Misjudged can often start a sentence. A sentence can end with misjudged.
That cannot be done.
Sure you can.
A capital letter.