Japanese From Zero! Questions

Questions about Course 3 Lesson 2

1.	3-2	How do you say "more than 10 times"?
2.	3-2	Will I sound weird if I don't use katakana words?
3.	3-2	Why do all dictionaries including YJ say SHIRANAI means strange and all Japanese people say it does not?
4.	3-2	Can you please explain how to use "へ"
5.	3-2	What is the layout of Japanese letters?
6.	3-2	What does ICHIDO mean? Is it a counter?
7.	3-2	Why is DA placed after certain words?
8.	3-2	Can I say AMERIKA DE or AMERIKA DE WA?
9.	3-2	What exactly does DOREGURAI mean?
10.	3-2	Why is the particle DE used in this sentence?
11.	3-2	How do I tell that it means once every 6 months or once in 6 months?
12.	3-2	Which particle should be used, NO or DE?
13.	3-2	What does OKARADA NI KI O TSUKETE KUDASAI mean?
14.	3-2	Can I say DONO GA ANATA NO PEN DESU KA?