I have a 2.5na 90
I have searched to try and find out when I use low range I have it in hi normally but what would I use low range? And why is there nuteral? Seems pointless
Any this may sound like a total stupid question but I would rather no then find out the hard way and do damage. When green Laning or off road do I use it straight away and also what about through water
... it depends ...
In my Disco I find the following works for me, but 'it depends'. Terrain, steepness, going up or down, sideslope, ground coverage, wet or dry .. wet grass, especially on a slope, can be treacherous!!
On-road Hi all the time, though Low can be used if towing a heavy load to initially start moving, double de-clutch to change to Hi on the move, or crash the box!! Low 1st to high first, high 2nd etc until you get to a comfortable speed for the load.
Off-road mostly Low, but green-laning can often be done easily in Hi. Steep uphill, probably low 2nd/3rd, steep uphill rocky steps low 2nd/1st, steep downhill low 1st or 2nd, feet off pedals ... Water crossings I almost always choose low 2nd, you need to keep momentum up, but have a reserve of revs/power available for deep pools or unseen obstacles .. 'it depends' ..
Slippery ground Low 3rd/Hii 1st, again it depends on how slippery and other factors.
Basically I'd suggest you go to a Pay 'n play site and instead of just driving round and playing do a little testing .. pick a hill or other 'feature' and try it in Low, Hi, all gears that seem fit for purpose, then do the same on another 'feature'. It shouldn't take long for you to get a feel for how each gear 'feels' and what it does when approaching stall speed or revving out. What works for me and my Disco might not work for you and your 90 ... different gearing, different wheel sizes etc.
Be aware 1st low is very low, you can get out, walk round the vehicle and get in again without worrying unduly, it should easily carry on on tickover ..

If you're in Low box, mostly set off in 2nd, maybe 3rd, again 'it depends' ..
Have fun ...