Because you only have seven letters in your rack, you can only make 8 letter words by hooking onto an existing word. You won't always be able to play QUIZZIFY or QUIZZING, for 41 or 39 points, respectively, but eight-letter bingos are among the highest-scoring plays in word games, other than semi-ridiculous words that require nine tiles already to have been played.
These common eight-letter words are ABSOLUTE, MOUNTAIN, and SENTENCE. All of these are excellent bingos, with SENTENCE and MOUNTAIN using the most common letters in the game. Using such letters allow you to put 60 or more points onto your score and also to allow you to deprive your opponent of such letters.
You have to keep your eyes peeled for open tiles that go with your existing tiles. Truth be told, playing seven-letter bingos is easier than playing those with eight letters, but an eight-letter bingo can get you back into a game or put one out of your opponent's reach. The best players usually score at least two bingos per game.
The letter C is one of those that you need to get rid of quickly, largely because, in Scrabble, there are no two-letter words starting with C. When it comes to 8 letter words starting with C, cheddars, coccyxes, and crappies are excellent choices. Each has multiple common letters that could be left open by an opponent.
Keep in mind that you will likely have to play a shorter word on your turn, and passing to wait for an opportunity to play 8 letter words starting with C can be a fool's errand. You would have to pass so many times, in all likelihood, that even playing COCCYXES for more than 20 points would only catch you up to where you would be had you played smaller words. Still, knowing all of your options is essential so that when the time comes, you can pounce.
Your ability to unscramble words must be trained and honed until you can anagram any rack you might draw. You have to be able to weigh the chances of scoring an eight-letter bingo against playing four 25 or 30 point words that would be the same as playing that one word. If you're miles ahead, for example, it might be worth it to fish for a single tile if the one you need is common, such as an A or an E, to make an eight, or even nine or 10-letter bingo. Taking wild chances seldom works in crossword games. Judicious use of well-reasoned gambles, however, is definitely a part of a winning strategy.
According to the Official Scrabble Player's Dictionary, Volume 6, there are more than 80,000 eight letter words.
Stations, surprise, syzygies, and stutters.
ELEPHANT, PLATYPUS, FLAMINGO