Ps: what parts of manaule do you mean before the oscilloscope arrives? however I have already read the first part of the manual ...
When you read through quickly, you are only learning what features the scope has, not how to use them. Later on, when you want to use a feature, you'll remember that it has the feature and that it is described in the manual. Then you can get into the details.
The manual won't make a lot of sense on first reading unless you have the scope sitting right there. Don't worry, you'll have a long time to play with the scope and manual together.
You will see 'buzz' words like Single Shot, Roll Mode, Volts/Div, Time/Div and many others. It's probably not possible to absorb all of these things on the first reading.