I am going to be joining a gym without a personall trainer and was hoping you bros could help me out with a routine. I am 6'1" and only 140lbs. so yea i am pretty skinny. Im looking to gain as much mass as possible. If you guys could help me with a weekly routine it'll be aprreciated. I just don't wanna walk into the gym and just start lifting without a set routine. I'll use this as an example:

Monday: Upper body (then maybe list the machines i should use)

Then help me fill in the rest of the week....Plus when trying to build mass, i know dieting is important i will be making a post in that section sometime soon, How do incorporate reps, do i wanna to 3 sets of 5, or 3 sets of 10 or w/e? Plus how do i know whats a good weight to start at? Should i be able to only complete one set with a particular weight and build myself up or what? I know this is alot but w/e help you bros could come up with will be aprreciated greatly, if not should i just go and get a personall trainer? Thanx again!!