How Much/Loan Balance
This is the amount you are expecting to borrow, or the amount you have leftover on a loan if you are calculating the interest rate of the remaining balance. This number is completely up to you, and it provides you with a way to find out how much you can afford to borrow based on the monthly payments you can afford as well.

How Long/Loan Term
This is how long you want to take to pay back the loan. Some loans have limited choices, but many lenders offer multiple payment plans for borrowers. The longer you take to pay it off, the more interest you are charged over time, but the lower the monthly payments. So there is often a trade off depending on your particular budget.

Credit Rating/Estimated Interest Rate
This is where you either estimated what your credit score is and, thus, what your interest rate will be. Most interest rates are based entirely on your credit score. Since scores range anywhere from 350-850, with 850 being the best, and you have a credit score of 700 you can assume you will be close to the "Good" rating, but not directly on the edge so your interest rate will not be the exact minimum.
Also, if you know what your interest rate is but not your credit score, you can get an idea of what your credit score is by where your interest rate falls on the scale.

Calculating Total Interest
Sometimes you will want to calculate how much interest you will have paid in full over the course of your loan. If you already have the balance, loan terms and interest rate (and any of these can be estimated if you are simply curious), you see what the calculated monthly payment is and multiple that times the amount of months of your loan. This is the estimated loan term, with years multiplied by 12 to get the estimated amount of months.

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