ok...check it out
the first thing you need to do is get on a bench press and get your max amount you lift one time...you will definitely need a spotter for this...cuz your max is something you barely get up...there are many diagrams and graphs out there that tell you what to work out with based on your max bench press...
there are two ways to lift: to get stronger and get minor muscle mass, and there is to get more muscle mass and get cut.
if you want the first choice, you would be lifting as heavy of weight as you can with less reps. This will increase your max lift, but you will still look the same. I have weighed between 150 and 160 for 5 or 6 years. I started out weight lifting with a max of 135 pounds on bench press...which is just the bar and a 45 on each side (the bar weighs 45 pounds on most bench presses. i kept on working out with as much as i could with 4 sets of 6 reps...it got my max up to 220 pounds pretty damn quick....but im still weighing the same....weird how that works
but then again i run too...so i stay in top shape...
anyways...if youre looking to get cut...you need to do more reps with less weight...hell...even push ups and crunches everyday at the house will help...i do a pyramid of push ups and crunches everyday...20 push ups:20 crunches, 19 push ups:19 crunches, and so on all the way down to 1 push up:1 crunch...it does wonders...but you might want to start out with 10 of each and work your way down...then as it gets easier you add more on to the pyramid...
the pyramid idea can go with bench press as well...start out very light...and do 20 reps...add 5 pounds and do 19 reps...add 5 more and do 18...and so on...until you get to your max that you are only supposed to be able to do 1 time...but dont get mad if you cant get it your first time on the pyramid...youre going to be slap tired once you get to it...
ok...you are wanting to focus on your upper body...but i hate it when guys go into the weightroom and only want their upper body looking nice and they neglect their legs and lower body...im like wtf! so...if you pan on working out monday through friday...pick monday, wednesday, and friday for upper boday and pick tuesday and thursday for lower body...
your upper body days will be strictly on upper body...dont do anything lower body related on those days...i usually start out with bench press, then move to curls, then move to decline bench press, then the chest machine, then incline bench press, then the shoulder pull down thingie, then the same machine only i stand up and push down with the rope to work my triceps...then i do some dips and get on some crunch machines...and i do many more machines...when im done...my upper body feels like rubber...if you dont walk out feeling tired...you didnt work hard enough...and if you arent sore the next morning...you definitely didnt work hard enough...
on the leg days...i start out with leg press...then squats...then leg lifts...then hamstrings which is the leg lift machine only the opposite way...then the calf machine...and then i jog...
anyways...ive rambled on enough...hope some of this stuff helps you out...good luck with the workout