Generally, industry standard is that your query should include a hook, a paragraph or paragraphs delving more into the book (generally, splitting into a couple paragraphs is better just because it's easier on the eyes than a big block o' text), and a paragraph including title, word count, genre, experience, etc. I was introduced to including that latter paragraph at the very end, but I've seen people who include it at the beginning, and I've heard of some agents who prefer it there, too. So basically you're taking a gamble of picking either the very beginning or the very end and hoping that's where any given agent will prefer it, because most of the time they won't actually tell you where they want it. Additionally, industry standard is to always write in third person, present tense. Be professional, and keep it ideally under 300 words, preferably even a little lower. Other than that... there's a lot of information out there, and some of it is conflicting, and that's because different agents prefer different things, and, again, a lot of the time you don't actually know what they want. It sucks, I know. So maybe it's easier to say that rather than an standard format there's a standard guideline. Keep within the general boundaries and see what works best for YOUR book.