I have mostly ls and a little mineral mud.
I started with ls and my refugium kit came with the mud.
You can use both. Its up to you.
Make sure any substrate you add is live with bacteria.
Otherwise it might get real messy. Substrate that has no bacteria tends to be easier to disturb. So it may cloud easily.
I would start out with a refugium kit, substrate and lr.
Most people favor cheato spaghetti macro.
But i like calurpa , because it looks better, grows fast, but can go sexual.
I had a 18w 50/ 50 pc on my 10g fuge and the plants did ok. A steady growth. But upgraded to about 50w flourescent house bulbs with 200w normal output. Growing alot faster than before.
Whats your email, i know a good site for refugium stuff.
I would wait to add any inverts to there for a little while. Atleast the sensitive ones.