If you have a handy tree/fence post etc then the strap that comes with most, if not all, trailcams is OK, but I've found using a tripod is much more convenient. I use an old cheap one as super rigidity is not needed. 7dayshop sell cheap ones that would be fine.
I find videos are more interesting than still shots, but it down to personal preference.
If you have a garden I'd try it there first to see what settings you like.
On the private land set it up close to routes used by animals - badgers for example can leave very clear tracks. If you want to bait the area, try peanuts. They are cheap and mice, voles, rats, foxes and badgers will eat them.
We use rechargeable batteries in the ours and find they need recharging, depending on the activity, about every three days or so. Unless I can get batteries out and new ones in quickly, the camera loses the date and time, which is really annoying when you view the recordings.
Dave
PS Checking the videos the following morning becomes addictive.