bro, ur questions are way to broad. anywayz. couple of sites that you can look out for is scott herman fitness,google him and he got tonz of fitness tips.
Bodybuilding.com's forum is a good place to learn and please please READ THE STICKIES on there. they have drafted out really good workout plans for beginners. Take your time to learn before jumpin the shark on the gym stuff. Lay down on some basic knowledge. key things about working out are workout with proper form and weight, nutrition and good amount of sleep. u will be set to go. i do advise personal trainer to draft out a workout programme. they can see whether u need work on any neglecting muscle parts, rotators cuff, injuries and all that jazz.
constant measurements like once a month and gauge monthly, with progress comes motivation.
good luck bro,