my experience on the matter
a few things to preface this reply
1. I am by no means an expert, this is just based on what I do
2. Welcome to the forums
3. Congrats on starting excersizing
ok now that that's out of the way here goes, I've found that when I do cardio before I do resistance training I don't have the strength that I usually do if I do resistance training first, so if I choose to do cardio and resistance training in the same day I always do resistance first. Also, depending on your diet, if you're in a caloric defecit for weight loss, meaning you're taking in less calories than your body needs to maintain itself in it's current form, then I wouldn't put too much of an emphasis on weight training, you need to do some, sure, but don't go crazy...from what I understand about our physiology, it is near impossible to build muscle while in a caloric defecit, because building muscle uses a huge amount of calories, i.e. you want to do your best to lose as much fat as possible before even thinking about building the muscle back, you can't do both at the same time, not for very long anyways...with that being said, the goal is to limit the amount of Muscle lost while in caloric defecit, because if you just diet and don't excersize, you will lose fat, but you will also lose a good deal of muscle as well...so the idea is to do resistance training or lift just for maintenance or to limit the amount of muscle lost, meaning it doesn't help to work your muscles until "failure" as someone else put it, i would do 3-5 sets of 8-12 reps at increasing weights until you can just barely finish your last set, and as said in a previous post, you want to make sure to give your muscles 24-48 hours for recovery. I lift on tues/thurs and do cardio on m,w,f because I am in a caloric defecit. I would read the stickies on this forum for better information, but that's my take on it, hope this helps.