L/R doesn't need certain lighting. before i got my PC's, mine was thriving (it is now too...) The only thing you need proper lighting for is photosynthetic stuff.
Also, if you have too much lighting during your cycle, you could cause an algae bloom. Algae feeds off of nitrates, and is photosynthetic. If you get great lights at this point, it's possible you'll get a bad outbreak. I'd suggest waiting on your lighting upgrade.
10lbs sounds good. If the LR is fully cycled, you can add as much as your heart desires. If it's uncured, you'll get an ammonia spike with however much LR you add. If you add a little, the ammonia will spike a little, if it's a lot, it'll spike a lot. You get the jist.
With LR, you want pieces that weigh relatively light. This means it's porous and has a lot of surface area for bacteria to grow on. You also want to look for pieces that will look good in your tank. Think about the aquascape you want, and purchase pieces that will fit with that plan.
To see if LR is cured, ask to take a piece out and smell it. If it has a rotten fish smell, it's uncured. If it smells like the ocean (in a good way), that means it's most likely cured. Whenever i look for LR, i try to find pieces with good hitchikers on it too. When you get better lights, you can probably find pieces that have coral frags on it.
