1、Your sencentes are right. And here are some differences among these 3 words: 1) 时候、时间： a) 时候 and 时间 are sometimes interchangeable, only that 时候 has stronger spoken language flavor. EG：时候/时间不早了。 b) 时候 and 时间 both mean "indicating a moment of time". But when the time indicated is definite, 时间 is used. EG: 不要忘记时间。 c) 时候 is used to indicate a specific time, usually with modifiers indicating the specific features in front of it.EG:在天亮的时候。 d) the length of time indicated by 时候 is not definite,usually with modifiers expressing the specific features of the period in front of the time.The length of time indicated by 时间 is definite, usually with modifiers expressing a specific time or date in front of or after it.EG: 忙的时候 VS. 一个小时的时间。 2) 时机 is a bit different from 时候 and 时间。时间 is indicatiing just the right time or opportune time, and 时机 emphasizes some favorable conditions of a moment. 2、个 is a meansure word. Meansure words are used after numerals or demonstrative pronouns.EG: 一个、这个. And 个 is the most common and multi-purpose nominal measure word.So, to take it simple, we prefer to say only 个 when 1+个 and to say 这/那 when 这/那+个. the sentence u mentioned here: 对我来说现在真的不是（个）好时机。There should be 个 here, but it might be said not that clear and too fast.

you totally understand about 时间、时候 and 时机. and I just want to say more about 时候 when you want to use the word "when" in english, it means you should use 时候 in chinese. for example, when I arrive, I hope you will be there too. --(当)我到达的时候，我希望你也在那儿。 so when = (当)......的时候 and for some situation, we will use 时候 simplier. for example, "when I was young, my mom always played with me." in chinese is (当) 我小 的时候，我妈妈总和我一起玩。 but you can also simply say 我小时候，我妈妈总和我一起玩。 or 小时候，我妈妈总和我一起玩。 and another special case that you should remember about 时候: 有时候 or 有的时候 means sometimes. I get up very early sometimes. 我有（的）时候起得非常早。 the difference between "在这方面我是新手" and “在这方面我是一个新手” is just like the difference between "I am teacher" and "I am a teacher" so you can see that 一个 means a and 在这方面我是一个新手 or 在这方面我是一新手 its the same. the first phrase is more official. 对我来说现在真的不是好时机。 = 对我来说现在真的不是一好时机。 = 对我来说现在真的不是一个好时机。 just like I am teacher and I am a teacher. I think you have not learned how to count in chinese. its a little hard for you because its very special. only chinese has this. I ll give you some simple examples here: the form is number + one special character (like 个) a teacher: 一名老师 a table:一张桌子 one person:一个人 two trees 两棵树 four computers 四台计算机 etc you can see that there is a character between number and object. if there is just one thing, you can just use the character to replace a(one) + the character as the your example, 我是个新手 and 我是一个新手 no difference. another example, 这一个 means this, and you can also say 这个 这一个书包是我的。 这个书包是我的。 this bag is mine. 这一只猫是我的。这只猫是我的。 this cat is mine. but if there is more than one, you have no choice. 这三个书包是我的。 there three bags are mine. so what you meet about 个, is something about counting. and it just uses 个 to replace 一个 its the same. but there is no a very clear rule about which character we shall use. the only way to understand this is : learn more.....then you can get a kind of feel..... what I can tell you is just like this: 只 is normally used to little animal 一只猫 两只鸡 for big animal, we use 头 一头牛 三头猪 棵 is for tree 一棵树 杯 is for something about liquid 一杯咖啡 两杯啤酒 a cup of coffee two cups of beer 杯 means cup (so this case is similar to english : 一 杯 水 a cup of water but most cases are not as you saw.)

1 the difference between时间and 时候 for example, 什么时候走？answer: tomorrow moring 什么时间走？answer:tomorrow moring 9 o'clock 时间is more specific than 时候 2 i'm a beginner in this aspect. 在这方面我是一个新手 我是个新手 我是新手 all of the translation is right , they are the same meaning.