1. Best sugestions for substrait im currtently leaning towards a mixture of seachem flourite, seachem black sand flourite and silica sand but am open to sugestions
If I had the money to cover the whole tank in Flourite, I would. Just one kind will do, take a look at the different types on their website and decide which one you want.
2. Co2 systems. I have seen a couple of the sodastream co2 systems as of late and was thinking about duin the same sort of thing but using a co2 canister from my paintball gun that i have spare. Have any of you done this and if so o you know where i can source a regulator from to fit?
Getting enough CO2 into the aquarium from a paintball tank is going to be tricky with such a small cylinder. If you do decide to do that, you'll need an adaptor to fit between the paintball cylinder and the regulator. If it were me, I'd use a big cylinder for a tank that size, it's better to get a big bottle so you don't have to fill it up so often.
3. Lighting. Leaning towards 2 x 250w metal halide's do you think this will be sufficent? If not what do you all sugest?
It depends on the height of the aquarium, more details are needed regarding aquarium dimensions.
4. Where is going to be the best place to source plants as i am going to need quite alot of plants and want them to be good quailty to start with so there isnt so much mucking around with replacing dead plants and such
Ask around on the forums, some local members might have a few they can spare or just buy them off TradeMe. Growing your own plants would be the best option though.
And finaly stocking i really want lots and lots of smaller schooling fish eg neons and that sothe scale of the tank looks huge with a couple bigger fish say maby 2 blue rams as i love the colour and shape of them
Is that a question? If so, yes small fish will work wonders for a planted tank.
filter media i was thinking of mabie dojng a mixture on the 3 different densitys of poret foam and mabie some noodles or something along those lines but yet again all sugestions are welcome thanks for any comments/ help with my questions just want to do it right the first time haha
Mechanical media first, most coarse to least coarse, followed by biological media.