do you want to go boost or keep it NA? this will effect what mods you get in the future.

what mods do you have right now? if all you have is an exhaust and intake, and intake manifold and 68mm tb would not be the best choice for next mod. finish up the basic bolt on's first with a header and cat. the stock fuel rail can support 600+hp, so you'll be fine with it unless you want some bling.

the stock ignition is perfectly fine. just tune it up with new oem wires, plugs, and coil.

cam gears are needed to adjust the cam timing. not necessary unless you have bigger aftermarket cams. you'll hear many different opinions on pullies, but i just say stay away from them. the 1-2hp they may give you isnt worth it.

if you really want performance, you cant upgrade one thing and not expect to have to upgrade another.