Welcome aboard BradleyZed1.
Without knowing your age it's a little hard to gauge but either way as a first car regardless of your age the 350Z would be expensive. I completely understand where you're coming from though as do the others above, ...hell we were all young once and the Zeds a great looking car.
One of our youngest Zed owners on here was around 18 I believe so owning one when you're young is not beyond the realms of fantasy although as mentioned the insurance won't be cheap and some companies won't even cover you for such a powerful sports car.
There are things that certain insurance companies will offer to help bring premiums down for younger drivers, first time drivers or just drivers in general like the black box option whereby they can monitor your driving or curfews etc. Your best bet is to try getting some quotes from various companies as well as trying the online comparison websites like GoCompare.
https://www.thinkinsurance.co.uk/landing/google/black-box-insurance/index.php?gclid=EAIaIQobChMI5peEk7aI2wIVbTPTCh1pmgV7EAAYAiAAEgKgGfD_BwE
https://www.confused.com/campaign/car-insurance/black-box?&mediacode=1583&mckv=soPS4hZTv_dc|pcrid|228878411022|pkw|black box insurance|pmt|e|slid||pgrid|49617608124|ptaid|kwd-326379458394&mkwid=oPS4hZTv&intent=ca-ins-si&ptaid=kwd-326379458394&loc=9045648&aud=kwd-326379458394&gclid=EAIaIQobChMI5peEk7aI2wIVbTPTCh1pmgV7EAAYASAAEgIqPPD_BwE&pgrid=49617608124
http://www.gocompare.com/?media=A147134&PST=1&device=c&gclid=EAIaIQobChMIp_WD2LeI2wIVRj8bCh3tGg31EAAYASAAEgKUe_D_BwE&gclsrc=aw.ds&dclid=COPr_Ny3iNsCFVg6GwodzzQJWw
Personally though with my sensible head on I'd say if I was you I'd buy a cheap low powered car, get through your first year driving, get some experience under your belt (maybe even doing a driving course, drift course etc) and bide your time so you can maybe then get a Zed after that year has passed.