"I plan on getting the .357 magnum for self-defense and range shooting, a 12 ga. shotgun for hunting, and a .22 rifle for small game. I really don't want to spend over $1000 for all of them. If I have money left over I may consider a plinker but...."
The deal is not only good, but great... to include the cleaning kit, the speedloaders, and to help you with the fundamentals for $250.00 is the perfect deal IMO, but a little reading and practice are definitely necessary as well. And being a former LEO I doubt he'd give a kid a piece of junk, but just make sure anyway. Also, it being a Ruger, it is a workhorse.
As far as the $1000 goes,
$250 for a .357
$250 for a shotgun
$225 for a .22 rifle
$225 for a .22 plinker
that totals $950.00 and you might even get them cheaper at a gun show.
but if you ask me, I'd forget about the .22 plinker. Just use your 357 w/ .38 spcl rounds. and save the rest of the money to put towards the innevitable... a second handgun of your choice. one that may be more concealable for your body frame.
Anyway, right now take the .357 and love it, live it and take care of it. It might save you and your's one day.