I find it difficult to understand how to translate some English expressions used to "link" sentences in order to make your language more fluent. For example:
"Ok let's meet tomorrow at 9... By the way, you can ask your friends if they want to join us"
"blablabla(long speech going on)...anyway, let's cut this boring conversation short — I want to show you my new car" --> change of topic
"I forgot to buy the cake. It doesn't do much good, anyway"
How can each of these sentences be expressed in Russian? Please provide me with some formal/informal variants (if they exist).