You've got the easy release cleats.
Look at the videos, and first job, put shoes on, and feel for the ball of your foot. Then, mark the middle of the ball on your shoe sole with a sharpie or similar. You start with the cleat level with this - your personal preference may be slightly further or slightly back. Start with the cleat straight on the shoe lines - you'll have it at an angle once adjusted. I set my cleat angle so the heal of the shoe won't turn/float into the crank - so tighten cleat (just do one shoe) then press into pedal, and see if the clat hits the crank - if it's no-where near adjust so it get's close-ish.
Your feet will then find their natural angle, but the last thing you want is crank strike. PS never assume shoes are the same, so you'll need to repeat the process again with new shoes, unless you get the same make with the same sole - even same make, but a revised sole can be drilled differently.