11m sounds good as a first Sydney kite, and it will work in the typical noreaster sea breezes. I haven't used a Neo, but I imagine it will do well as a first kite as the things that make a good surf kite also make it a good beginner kite (easy relaunch, pull and go, no worries about overflying).

Later you'll want a small kite (8m?) for stronger winds, and maybe a light wind kite if you're keen on the light days. No need to rush out and buy those though.

Generally most modern kites work on an equal length four string bar, but it looks like North uses a "high y" so might not fly 100% on the more common "low y" bar. Especially as a beginner I'd get a matching North bar.

You'll also need lessons, so ask your teacher when you start. Flying a trainer kite is safe enough by yourself (somewhere not crowded!), but the large kites could take a finger or throw you high into the air and then onto rocks. My tip is that when you're learning to waterstart body drag out far enough that if you lose control your kite won't hit land.

Good luck!