Our friend is asking us where we will go. Because our friend responds generically, we can answer in whatever way like. For the sake of illustration, we will suggest going to the library. ‘ましょう’ sentences are assembled like any other verb sentence, so we are already familiar with its construction. We can add ‘か’ to the end of a ‘ましょう’ sentence to change its meaning from ‘let’s’ to ‘shall we,’ which would be equally appropriate for these questions. We arrive at this sentence:
図書館に行きましょう。
としょかんにいきましょう。

Our friend is asking us where we will go. Because our friend responds generically, we can answer in whatever way like. For the sake of illustration, we will suggest going to the library. ‘ましょう’ sentences are assembled like any other verb sentence, so we are already familiar with its construction. We can add ‘か’ to the end of a ‘ましょう’ sentence to change its meaning from ‘let’s’ to ‘shall we,’ which would be equally appropriate for these questions. We arrive at this sentence:
図書館に行きましょう。
としょかんにいきましょう。

‘それから’ roughly means ‘and then’—it is a very common expression in Japanese, and correctly incorporating it into your speech and writing will go a long way to making you sound like a more natural speaker.
Our friend is asking us what we will do there (the location we picked in the first question). Because our friend responds generically, we can answer in whatever we like. For the sake of illustration, we will suggest studying economics and then reading a Japanese book. ‘ましょう’ sentences are assembled like any other verb sentence, so we are already familiar with its construction. We can add ‘か’ to the end of a ‘ましょう’ sentence to change its meaning from ‘let’s’ to ‘shall we,’ which would be equally appropriate for these questions. We arrive at this sentence:
経済を勉強しましょう。
けいざいをべんきょうしましょう。

Our friend is asking us what we will do there (the location we picked in the first question). Because our friend responds generically, we can answer in whatever we like. For the sake of illustration, we will suggest studying economics and then reading a Japanese book. ‘ましょう’ sentences are assembled like any other verb sentence, so we are already familiar with its construction. We can add ‘か’ to the end of a ‘ましょう’ sentence to change its meaning from ‘let’s’ to ‘shall we,’ which would be equally appropriate for these questions. We arrive at this sentence:
経済を勉強しましょう。
けいざいをべんきょうしましょう。

‘それから’ roughly means ‘and then’—it is a very common expression in Japanese, and correctly incorporating it into your speech and writing will go a long way to making you sound like a more natural speaker.
Our friend is asking us what we will do there (the location we picked in the first question). Because our friend responds generically, we can answer in whatever we like. For the sake of illustration, we will suggest studying economics and then reading a Japanese book. ‘ましょう’ sentences are assembled like any other verb sentence, so we are already familiar with its construction. We can add ‘か’ to the end of a ‘ましょう’ sentence to change its meaning from ‘let’s’ to ‘shall we,’ which would be equally appropriate for these questions. We arrive at this sentence:
日本語の本を読みましょう。
日本ごの本をよみましょう。

Our friend is asking us what we will do there (the location we picked in the first question). Because our friend responds generically, we can answer in whatever we like. For the sake of illustration, we will suggest studying economics and then reading a Japanese book. ‘ましょう’ sentences are assembled like any other verb sentence, so we are already familiar with its construction. We can add ‘か’ to the end of a ‘ましょう’ sentence to change its meaning from ‘let’s’ to ‘shall we,’ which would be equally appropriate for these questions. We arrive at this sentence:
日本語の本を読みましょう。
日本ごの本をよみましょう。

Our friend is asking us what time we will meet. We can answer in whatever we like. For the sake of illustration, we will suggest meeting at 1:30 pm. ‘ましょう’ sentences are assembled like any other verb sentence, so we are already familiar with its construction. We can add ‘か’ to the end of a ‘ましょう’ sentence to change its meaning from ‘let’s’ to ‘shall we,’ which would be equally appropriate for these questions. We arrive at this sentence:
午後一時半に会いましょう。
ごご一時半にあいましょう。

Our friend is asking us what time we will meet. We can answer in whatever we like. For the sake of illustration, we will suggest meeting at 1:30 pm. ‘ましょう’ sentences are assembled like any other verb sentence, so we are already familiar with its construction. We can add ‘か’ to the end of a ‘ましょう’ sentence to change its meaning from ‘let’s’ to ‘shall we,’ which would be equally appropriate for these questions. We arrive at this sentence:
午後一時半に会いましょう。
ごご一時半にあいましょう。