See a decent PT to get some good technique before trying the Olympic lifts; you’ll get better results and less likely to do yourself an injury – form is important! Learn to squat, dead-lift, press and bench – then start on complexes, getting stuff overhead and upping the weights!
I’d say dead-lifts can be up there with squats for core strength for what it’s worth.
(Machines; god’s way of keeping the idiots off the barbells according to my PT. Aside from cables and TRX there’s not a machine to be seen in my local gym…)