Getting close to my 1st brew in 20 years or so.

[Mick Almost Total Newb]

The mangrove jacks M76 yeast is recommended to ferment at 8 to 14°C.
You say your aiming to ferment under pressure in the Fermzilla at about 12 PSI. That will mean by the end of fermentation you will have carbonated beer so you won't be adding sugar to the bottle beer, and you will need some type of counter pressure bottling device and yes you will need CO2 gas to provide the counter pressure.
The use of a hop bong also requires CO2. I've been using pressure fermentation for a long time and I've never needed a hop bong, so unless you're going to attempt heavily dry hopped beers I wouldn't bother.
At 10°C and 12 PSI carbonation will be a little low for a lager. If you increase the pressure towards the end of fermentation that will increase carbonation. The amount of carbonation is dependent on a combination of temperature and pressure.
You won't need a bottleing bucket as you will be bottling direct from the Fermzilla.
Here is a link for a carbonation calculator.

https://drhansbrewery.com/beercarbonationcalculator/

Really appreciated Davegase. I hadn't seen the instructions on the yeast when I posted that. I've now seen that it recommends 8 to 14. I've just set the wort in the fermzilla, and currently 15.3 degrees so waiting for it to drop a little before adding the yeast.

I've set my rapt at 12.5 as although everything I've seen says you can go higher under pressure I though for this 1st attempt id keep it on the higher end of the recommended levels.

Need to figure out how to set the spunding valve, I guess I need to wait for a bit of pressure to build the adjust until I get it to 14 is so.

Fingers crossed all goes OK. But nothing ventured nothing gained.

 

[Davegase]

Really appreciated Davegase. I hadn't seen the instructions on the yeast when I posted that. I've now seen that it recommends 8 to 14. I've just set the wort in the fermzilla, and currently 15.3 degrees so waiting for it to drop a little before adding the yeast.

I've set my rapt at 12.5 as although everything I've seen says you can go higher under pressure I though for this 1st attempt id keep it on the higher end of the recommended levels.

Need to figure out how to set the spunding valve, I guess I need to wait for a bit of pressure to build the adjust until I get it to 14 is so.

Fingers crossed all goes OK. But nothing ventured nothing gained.

When I ferment lagers under pressure, I prefer to ferment towards the lower end of the temperature range so that I don't need so much pressure to achieve the carbonation I'm aiming for.
I would recommend gradually increasing the pressure towards the end of fermentation.
That carbonation calculator is a very good guide.
Have a tap that you can use on the Fermzilla for taking samples ?
My first batch I ever did in a Fermzilla I dispensed the whole batch with a picnic tap.

 

[Mick Almost Total Newb]

I hadn't even considered carbonation levels. That calculator looks really useful, thanks.

I am looking at getting a tap, but not yet. I've been in contact with somebody who used to have a business setting up home bars who says he has equipment left over if im interested (corny kegs, taps, lines etc). If that doesn't come to tuition I picnic tap is a good shout.

I expect I will be keen to get the beer shifted though so I can start fermenting something else. I doubt lagers will be my goto. Just went with one 1st as it seemed they could be quicker.

 

[stripeyjoe]

Unless you are making really hoppy NEIPAs then the hop bong is probably unnecessary. I just bubble CO2 in via the gas post, crack the lid open and chuck the hops in.