Hi Carl thanks again.
I forgot to mention that I did follow the 50% guideline the first week of training (so basically the week that I posted is my 2nd week into the program).
Here is my 1RM estimation for the lifts:
BB row 130
DB Bench Press 70's
DB press 55's
BB curl 50
So I worked out with half of that weight the first week. and I was able to complete all the week's work. fairly easy
And as in the OP says:
"a reasonable weight to work at for straight sets, is one that lets you complete 2 sets at full reps, and has you stuggling to complete the third."
and because I wasnt struggling in the third set. I decided to increase the weight, maybe I went a little high on some exercises but still I was able to complete the total work of the week. so still Im questioning myself I f I should keep working out from that weight or I f I should go back to 50-60%