Question: When a first person character is thinking something or express their feeling in thought, should I type it in italics? For example: She rummaged through a drawer and held out a pamphlet. A pamphlet? What's she going to do, smack me in the face with it? (So, should I just leave the font the way it is, normal..or should I put "A pamphlet? What's she going to do, smack me in the face with it?" in italics?) Also, when is the right time to put sentences in bold or italic? Answer:
Some writers prefer a character's thoughts to be in italics, but not all do. It's a matter of choice and whether it would seem confusing not to use italics. But if you italicize thoughts in one part of a manuscript, you must italicize them throughout to be consistent.
That said, in standard manucript format, you don't actually use italics for words that should be in italics. (Yes, you read that right.) Here's why...
The standard font for manuscripts is Courier 12pt, because this font mimics the old typewriter fonts in that each character takes up the same amount of space on a line, making it easier to estimate word counts. However, in Courier, italics don't look a lot like italics which makes it easy for editors to overlook them.
In the old days, when writers used typewriters, the standard technique was to underline anything in the manuscript that should be in italics in the printed book. Underlining was a signal to the printer that those words should be italicized, and this is still the standard. So underline, don't italicize.
Apart from thoughts, italicize (underline) foreign words and phrases, the titles of books or artistic works that are standalone (not part of a bigger publication) and the proper names of ships (e.g. Titanic
Don't use bold at all in a manuscript. Stick with the same font and font size throughout. And don't use any other font effects. Let the words themselves communicate, not the typography.