If you have more LR already, add it now. If that's all you have, that's fine. Just after your cycled, if you get more rock, either get dry base rock and rinse it off before you put in tank or only get 1 piece of LR at a time. If you add too much LR to a cycled tank, you could set off a mini cycle and hurt the fish.
A specific gravity of 1.026 is great- I think most people keep theirs at 1.025-1.026. The light looks nice!! I love LEDs. Let the shrimp rot in there, you can test ammonia, nitrite and nitrate every day during the cycle- it's good practice.
You'll see ammonia go up (needs to get to at least 4ppm), then it'll start to decrease and nitrites will rise and then decrease, then you'll get nitrates. When ammonia and nitrites spike and return to zero, then you're cycled. Your nitrates will probably be high at that point- do a PWC to get them down below 40 (lower is better though) and then your ready for fish!! This is a great time to research fish you wanna get.