No, the weapons in all versions of Draken are just for show and the simulated radar has no targeting function.
There are several third party solutions for adding functional weapons to FSX and Prepar3D vehicles. You can probably modify Draken to use these add-ons, and you may also share these modifications within the limits of the EULA.
Read the Flight Manual which can be found on the Help page. It explains the procedures for startup, takeoff, climb, cruise, approach and landing, as well as how to use navigation systems, radios, etc. If you are really impatient, just use the checklist in the kneepad (although it may be difficult without first reading the Flight Manual).
For Draken 5.0 you can use the support forum to get help and to submit feedback. As a last resort, you can always use the contact form if you need help.
The FS9 version includes a complete Austrian J-35OE exterior/interior model, but the FSX and Prepar3D versions only contain the Swedish J 35J.
A J-35OE version for Prepar3D V4 is on the roadmap, but there is no timeplan yet.
The Danish F-35 is very different in instrumentation and systems as well as structurally and aerodynamically. There are no plans for a Danish version at this point.