:1,%s/old text/new text/g
1 -> first line
$ -> last line
s -> replace
you cannot use wildcards (*,?) for the text to be replaced, but you can use e.g. [0-9]
Press J, it concatenates the actual and the next line.
repeat last action
In the order mode, press ..
u undoes the last action
- CTRL_v and mark lines in the block mode
- CTRL_i insert the wished items