There are multiple ways of doing this told below:
**Box select**: press the b key and you can click and drag a square that will select everything inside.
**Circle select**: With the C key your mouse will show wit ha circle anything clicked in side the circle will be selected.
**Holding shift**: You can manually select each vertices and hold shift down while at it to keep the previous selections as well. **Select whole object** With one vertices selected of an object and pressing ctrl-l you will select the whole object itself that is part of that one vertices you selected at the start.
It seems you are a beginner **these option should be enough and t move then you can use the transformation** manipulators(using arrows on the screen) or press the **G key** while selected to move it as well.