To create a Google Form, you just navigate to your Google Drive and click on the blue "New" button, mouse over the "More" option at the bottom and then choose "Google Forms".
(You could also download an awesome extension that allows you to create a new form (slide, doc, spreadsheet or drawing, too) from anywhere on the web, just by clicking the button. Read about this must have extension here.)
This will take you to a new untitled form. The first thing I recommend is to give your form a title so that you can find it again later. Take a look at the interface you'll see. You can click on the image to make it larger.
Let's take a look at the settings menu you can access by clicking on the little gear icon in the upper right. This menu has three tabs. The first one that comes up is "General".
The top check box restricts this form to just your organization. This is great if you are using this with colleagues or students, but if you want parents or the public to fill out the form - you'll need to uncheck it.
The second box to collect email addresses only appears if the top box is checked. This is nice because if you are a teacher and you check the first and second boxes, it will automatically tell you which student is responding to the form.
The third check box does just what it says - only allows the respondent to submit once. If you check this box, it will require users to log in with a Google Account - though it won't tell you who they are unless the first two boxes are also checked.
The bottom two links will decide what the respondent can do after they submit.
The next tab in the menu is "Presentation".
The top option shows a progress bar for the respondent so that if it is a long form with many pages or "sections" they will see how close they are to finishing.
The second box will shuffle the question order on each page or section. It will not mix questions with questions from another page or "section" of the form.
The last box allows you to show a link to return to the beginning and take the form again - this is nice if it is a form you are filling out repeatedly for different students.
The last section is a place for you to put a confirmation message. This is what your respondents see once they hit the submit button.
The last tab in the settings menu is "Quizzes". You can use this to make your form into a self grading quiz. If you want to know more details about how to do this - you can check out this tutorial video.
There are many question types you can choose from. The default first question is a multiple choice question, but if you click on "multiple choice" it will give you a list of other question types.
Once you choose your question type, it will give you the options to enter your answer choices. You have mostly anything you could want here, except true and false - but I just do a multiple choice question with only two answer choices - true and false.
You can make a question required - meaning the respondent cannot submit the form without answering the question - by clicking on the "Required" slider to turn it on.
To get a few more options for your questions you can click the little three dots icon in the bottom right corner of the question. It will give you different options depending on your question type.
The most common ones you might need are to show "Description" which allows you to give a little direction about how to answer or if you want to put in an example. Another one might be to show "Data validation" for a paragraph or short answer question, which allows you to make the answer be something specific like it must have an @ symbol because they are suppose to type an email address or something like that. You can also choose "Go to section based on answer" for multiple choice which can send them to a separate page depending on which answer they choose.
Adding Images for a Specific Question or Answer
You can add an image as part of your question, or as part of a multiple choice answer option. Click on a question to edit it. If you put your mouse on the Question text, a little image icon will appear to the right and you can click on it. Same for putting your mouse over an answer choice.
Adding Other Items
Adding a title and description lets you put additional text into your form that isn't necessarily tied to a question. It can be instructions or other information that your respondents need to know.
Adding a section adds another "page" that your respondent will see. For example, they might answer some questions and then click next to answer more questions. It only shows them one "section" at a time and they will need to click to go to the next section or page.
Customize the Look
You can customize the look of your form by clicking on the color palette in the upper right. When you click on the palette, you are shown a variety of colors. If you want something a little more decorative, click on the little image icon in the bottom right to be taken to a window where you can choose from many different themes or even upload your own image.
You can learn all about how to find and analyze the form responses in this "Where Are My Responses?" post.
How to Send Out My Form
When you are all finished creating your form, you can click the "Send" button in the upper right and get some options on how to distribute your form.
There you go! That should give you everything you need to know to start creating your very own Google Forms. Have fun!