Yes
can a ex-felon from california get a guard card in nevada.
yes of course as long as the land was obtained legally.
No. Once you are a felon, you can no longer own a handgun in any U.S. state. How long you served in prison or the fact that you are now out has nothing to do with it, although, a felon can sometimes have his rights restored, but for information on that, you really should contact an attorney familiar with the process.
Yes.
can a convicted felon's wife own a firearm that is not in his home
There are no laws that state "a felon may not own investments", specifically. However, there are specific investments that a felon is barred from. For example, a felon may not own a liquor establishment.
There is no Texas law that says a felon can not own a taser.
No. There is no state were a felon may own any firearm.
no felon can own or purchase a gun
The short answer is, if you are a felon, you can't own or possess a gun.
No. Nevada is a land-locked state.