when you hit the weights here is a tip that works well for me.
first make sure you understand the machine (if you are on one) or if you are using free weights make sure you understand proper stances and the correct way to lift without hurting yourself.
next just hit each machine that you want, that one where you lift things over your head looks cool? try it, find a weight that is enough to make you realize its heavy but that you will be able to lift maybe 10 times (dont worry if its less) then just lift it til you cannot reasonably lift it again (DO not strain really hard to get one or 2 more lifts) and move on to a new machine.
2 things happen here, the first being the next day you are going to be sore in places you didnt even know you had, then second being that you will have an idea of what works for you and what you like, and what it feels like with the weight training. the third being you are not incapacitated because you didnt over do it on anything, you will be sore but not so sore you cant get around. a pleasant kind of sore.
I stress this part because many many people will tell you to start out with multiple reps on one machine blah blah blah, if you hurt yourself you wont want to come back, and while I realize you are on a time line, you need to realize that this means patience is even more important…if you hurt yourself you will have to stop working out til you heal.
but once you feel stronger and better you will be able to hit the machines harder. I have neck problems so for me machines are the best bet, with free weights if I even turn my head during a lift I can screw things up so the machine puts me in the right position to get the work out without getting hurt…also dont let anyone tell you you need to work harder at this or that or more of this or that (well your trainer should know but not random people) They might think they are being helpful and they might have good suggestions but they dont know you or your limitations. (like with my neck, I am a big guy and its not obvious at all that I have a problem so I sometimes get that whole “Free weights are better, you get a better work out and are stronger with free weights” crap every now and then, and like I said, free weights mess me up if I do anything even a little bit wrong)
also have fun, seriously.
(I always talk about fat loss, not weight loss, because if you are exercising you will add some muscle.)