Howdy!
There are many sources of info on or about this rifle available here on the web and also in your favorite magazine store, much of my info comes from there.
First thing, is the weapon a P14 or a P17? The P14 was the stopgap weapon that was supplied to the Canadians and the British (by the US) during the first big war. It was chambered in .303 British to make feeding it relatively easy - as this is what their SMLE was chambered in. If the weapon is a P17, then it should be chambered in 30-06, as it was intended for US Troops. Make sure that you are feeding this piece the right fodder!
As far as accuracy is concerned, there are many different factors that come into play. If this rifle is in at least NRA good condition, then 3-5 minute groups would be a good ball park. If the barrel is dark and pitted, if the action is loose, these small details can affect accuracy. Bottom line, check the weapon over minutely, and if you're clueless, admit it and bring the weapon to a gunsmith and have him look it over.
Range of the Default aperture - This is where the phrase "Point Blank" came from I think. On WWI battle rifles, it was sort of like what we now call "Battle Sight Zero". I won't try to blow smoke here, my guess would be somewhere between 300 - 500 yards.
Ammo sources to avoid - I don't think that anyone will dispute that you should avoid corrosive primered ammunition. In Shot gun news and other sources, the type of ammo, ie: Berdan primed/Boxer primed, corrosive/non-corrosive, ball/FMJ/etc. is usually prominent in the ad. I'd avoid any source that doesn't give that kind of information. I personally go one step farther and buy ammo that is boxer primed, as I intend to reload the cases.
Recoil - This is something that you're going to have to learn for yourself. If I (or anyone else for that matter) told you that that weapon kicked like an Angry Mule, would you even fire it? Recoil is a mental thing I think. I've seen big, burly guys shy away from a .44 Magnum pistol, "Because it kicks, Man!", and yet Elmer Keith was a short, squatty Man, and he'd fire his all day long. Any one who's ever loaded (and fired) his 'Pet' .44 Mag load KNOWS that it is a sonuvabitch! I still remember the first time I fired a '03 Springfield. Nick-named the "Cheek Buster", it's English style stock was held so tightly to my cheek, my face was white for a week. I tightened up on the trigger, expecting the worse (jerked it too!)and the result was so anticlimatic, I had to work the bolt JUST to see that the weapon DID go off! So, don't worry about it! Concentrate on the sights, take up the slack in the trigger, and roll with it. You'll probably find the recoil to be pleasant, and will work the bolt as fast as you can just to send another down range! Good luck and stop yacking and go burn some powder!
Unkel Gilbey