My tip is try to have a protein shake every day. I use a whey protein powder and mix it with fresh fruit, nf yogurt/milk and ice and it makes a good fruit shake. Whey protein is really good for building lean muscle.
Yeah.. that's a common myth. Whey protien is good for providing your muscles with energy and allowing them to grow in size and if you are a heavy body builder, by all means, go for it. But how "lean" your muscles are is a fact of genetics and not what you consume. Nothing you eat will make your muscles "leaner." Which is a non-sense phrase anyways...
On top of that, no one who eats a healthy diet EVER needs to add protien into their food. You get plenty of protien from your yogurt/milk. Anything you add on top of that is a waste of time and money. So unless you're a vegetarian or otherwise protien deficient...
And your muscles only crave protien right after a workout. So unless you are drinking that shake within 30 minutes of lifting.... then again, it's a waste.
Don't take my word for it though. Research it some.