I do the highest resolution it will go, shortest delay it will go, 3 photo. More often than not, only 1 of the 3 photos gives a good shot of the animal. Especially if you are looking at antler size. Usually bad angle or blurry. Also will catch a second animal trailing the 1st if they are moving. Think of a buck trailing a doe. Would never even consider running 1 photo. I run 16GB cards, and have had thousands ... forget exactly but around 3000 pictures and there was plenty of space. I wouldnt be overly hesitant to run 8gb ... especially if you plan on checking regularly. I go 6+ months frequently. I would look at your camera as far as card speeds. I think mine suggest a class 4 or something. I have ran a 5$ card reader that plugs into my phone for 3 years now with no issues. Light, always have it in my bino harness. Something I dont do, but its on the list, is to carry 1 backup card in case Im checking cams and are having issues and can switch cards. I guess Id also suggest carrying a set of batteries. I just put out a cam with 10% life left ... didnt have extras with me. Kicking myself for that after driving a few hours and hiking in. Little extra weight is worth it if you are out checking cards. I try not to put any trail cams where I expect human traffic, but even in some crazy locations I get people. I dont run any locks ... personal preference. Extra cost and if they want it they will get it, the plastic tabs holding the cable on for most of the trail cams isnt going to stop a 5 year old with a 2$ pocketknife.