I just want to bring a different (not better or worse, just different) POV to this discussion.
What I read, you already have some lights, that you’d like to use. The important difference, not only for your start, is how you’d like to control these lights.
One way, you change your switches/dimmers to a smart variant. Doesn’t matter for now, if Zigbee, Z-Wave or even Wifi. This gives you the possibility, to control these via HA and the physical switch/dimmer.
The other way is to change the bulbs to a smart variant. Here you can control the bulb by HA, but not by your physical switch. Another disadvantage, if someone turns the physical switch off, your smart bulb isn’t smart anymore, because it has literally no power.
Where you’re going from here, is entirely your choice, as it depends a lot on what you want to invest. And it depends on what you want to change in your home. Don’t worry, this is not a “do or die” choice, you can always work with both things.
I’ll give you an example from my home: where I want/need to switch things, even when my HA is down, I use Shelly switches and dimmers. They control my lights, and make them smart (=> simple bulb, not smart). I use this for the “main” lights, that I need to be able to switch, whenever I want. If HA is up, fine, if not, fine as well, I (and more important all others in the household) can still turn the lights on and off.
On the other hand, I have a small light on my sideboard in the hallway. This light is mostly decoration, so I don’t need to be able to control it, without HA. This is just a simple lamp with a smart bulb. 
In my opinion, this is the first thing, you have to decide, before you start thinking on how to build that in your home.
After that, one (we) can give a more solid advice, on what to use (and buy). Before I forget, please post the region of the world, you’re living in. Europe is different to the US or Asia, in regard to what is available for a reasonable price.
To make it easier for us, and for you, would you mind just writing down a short list, what exactly you have available, and what you want to use from that. Just give us a little insight, on how your home theatre should work in the end. Something like “1x LED stripe behind the TV, no need to physically control it”, “1x Light with smart bulb, needs to be available without HA”. You get the idea. 
As I said, which system(s) you use later on, isn’t important for now. This comes with availability and costs. So let’s see first, where you want to go, and then we can see, which system fits your needs best.
