Please help me!

Please help me!
One day when Tom went home,he found a note from his twin borther Sam on a table.It said,"Dear Tom,I will have a singing competition tomorrow.I'll stay at a hotel with our music teacher tonight.When I'm away,can you help me?And if you do that,I will give you a big surprise.Would you mind feeding my little dog?And could you please water my flowers?Also please send a thank-you email to my pen pal called Julie because of her beautiful pictures.Thanks.Love,Sam.
Tom smiled.He always did something for Sam.First he gave the dog some food.Then he got some water for the flowers.And when he started to load the email,he realized that he didn't have Sam's code.What a careless boy!Then he just looked through some news on the Internet.
1.Who wrote the note?
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2.Why would Sam like to send a thank-you email to Julie?
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3.What did Sam tell Tom to do?
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4.Did Tom help Sam with his email?
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Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!Please!