This is good advice, but it needs to be followed only after you know EXACTLY how to perform these exercises. Doing them improperly is just asking for trouble.
You can start by reading "Starting Strength" by Mark Rippetoe. If you don't feel confident that your form is correct, you can join a forum like the one over at stronglifts.com. They will probably be happy to review a video of you doing the lifts to let you know if you're doing things right or wrong (and what to fix, if it's not right).
Although, if you can swing it, I'd recommend finding a trainer to start you off.
I second the recommendation for Starting Strength. Strengthening your entire posterior chain (hamstrings, "glutes", lower back and upper back will do wonders for your back problems.
Having said that, spending 1 hour a day fixing your problem won't be enough when you're spending the other 23 hours undoing it. Sit up straight or do as I did and get a stand-up desk.
You can start by reading "Starting Strength" by Mark Rippetoe. If you don't feel confident that your form is correct, you can join a forum like the one over at stronglifts.com. They will probably be happy to review a video of you doing the lifts to let you know if you're doing things right or wrong (and what to fix, if it's not right).
Although, if you can swing it, I'd recommend finding a trainer to start you off.