In general, there is no clear structure for a table topic speech, since the topics vary from absolutely absurd to very serious. Thus, the following 10 tips, as presented in the official toastmasters website, give you a general perspective on the content of your speech:

1 Don’t Panic.
 If you can, just stop caring about Table Topics. Remember, everyone in the audience has been in your position, has probably dried up at some point and is willing you to do well, so you don’t need to worry about their reaction.

2 Buy Time. 
Give yourself time for your nerves to die down and for you to think of something to say. Sit at the back of the room and walk slowly to the front. Acknowledge the audience and repeat the question. If you need to, just talk for a while about something vaguely related to the theme, or even about something totally unrelated: Sooner or later, inspiration will come.

3 Go with the first little idea that comes into your head. 

3 Step Method
Step 1: Take Notes, according to goals. Just 2 columns, what I like & what can be improved. Look at 3 things: Speech Organization (flow, strong opening, middle, conclusion), Speech Mechanics (gestures, vocal variety, eye contact), and Speech Emotions (convincing and enganging).

Step 2: Quickly Prepare for Evaluation. Keep it simple. Find 1 thing that was special, above expectation. Also 3 more things that I also liked that relate to the goal. Finally, provide 1 thing that takes her speech to next level.
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Step 3: Deliver the evaluation. I need to educate and motivate. Starts positive, smth to improve, and finally some encourangement. Give smth memorable and specific. Get quickly on the points. 

Next some general notes I find quite useful.

• ​The evaluation speech is not a simple speech, but it should be a creative performance that could capture audience attention.
• Don't be afraid to go deeper into details. Don't be afraid to hurt feelings. You need to provide extra value. Be unique in your comments.
• Give examples on how to become better speaker or provide vivid examples from the speech and highlight them.
• Focus on the speech objectives, not general remarks.
• Acknowledge your tone and body language while delivering an evaluation. ​
• Use your time wisely: Start with a strong opening line --> one great highlight from speech --> Two things the speaker can improve and presenting the examples on stage --> summary

General Remarks
​Feedback is information about what was observed. This allows the speaker to better understand how he or she is being perceived.
Typically feedback is given in