¡Hola! Me encantaría ayudarte.
The affirmative tú command is just the third person singular of the verb (unless it is a weird irregualar word like tener or ir; you will be able to tell which ones are irregualar as you listen and read lots of Spanish).
In the first part of question, we just need to switch this form and then put "por favor" on the end to be polite (and it follows the model).
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1. saca tus apuntes, por favor.
2. envuelve el regalo, por favor.
3. sirve el pastel, por favor.
4. cierra la puerta, por favor.
5. pon las decoraciones, por favor (this one is irregular)
6. llega temprano, por favor.
7. aprende español, por favor
8. bebe el jugo, por favor.
9. vende la casa, por favor.
10. comparte el helado, por favor.
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For this next one we just answer with sí, use our affirmative command, and then put por favor.
With our affirmative command though, we are going to need to end it with lo, la, los, or las (depending on what thing we are talking about). This will give us more definition (wash them instead of just wash).
Also, we are going to have to put the accent on the first vowel of some of the commands (the regular ones, not the irregular ones) too because by adding lo, la, los, or las on the end, the word becomes longer and the accent would move (the natural accent is on the second to last syllable). However, we don't want it to sound like lavalos (with stress on the second a). We want it to still sound like the normal command, so it is lávalos. This can also vary depending on the word (preparar has a natural accent on the second syllable), but all of these are shorter words, so this will work.
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1. Sí, sírvelo por favor.
2. Sí, pídela por favor.
3. Sí, hazlo por favor. (no accent here; haz is only one syllable, not two)
4. Sí, bárrelo por favor.
5. Sí, ponla por favor. (also irregular, one syllable, no accent)
6. Sí, cómpralos por favor.
7. Sí, véndelos por favor.
8. Sí, pásala por favor.
9. Sí, córtalo por favor.
10. Sí, tráelos por favor.
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¡Ten un buen día y sigue aprendiendo!