Please be a bit more specific.
Offline
The scripts for a first person shooter vary a lot and around a lot of factors, for instance, what do you want the game to be like, what parts of the first person shooter do you want the scripts for?
Offline
For a start, to make a cursor for it, make a new sprite, draw your cursor, then put in a 'When FLAG clicked', then put in 'Forever', inside that 'Forever' put in, from movements 'Go to []'. inside the box, select mousepointer. Now click the green flag and your on your way!
Offline
Also, make a variable, call this 'Health'let this hang in the corner by ticking the box next to its name. Put in your sprites name 'Your' so the variable reads 'Your Health'
Offline
Oh and put in 'When FLAG Clicked' then 'Set [] []' select 'Health' for the first box, then Set the 2nd to 100.
Offline
ntpockets, all of the scripts you need are collected in this project:
http://scratch.mit.edu/projects/jammiefishface/1523340
Hope this helps.
Offline