the best thing to do,
go down to you closest shop, BZ for me,
and spend literaly hours trying stuff on, and asking questions.
i personly would get the mask and a steely bottle new, but once you know what you wont/need look through the classifides and get the rest.
but if you just wont a list;
mask - JT proflex, flex 8, e-vents, dye i3
hopper - halo B, empier B, viewloader's
clothing - proto, dye, plant eclips (smart parts if your on a budget)
tank - all depends one budget, i have a aluminium one, not much heavier than fiberwrap, but alot cheaper
pack - that empier one iv seen you going for is good for £10, (the other is myn now)
gun - torny or milsim? SP1, ion, ego05/06, PRM06/07 depends on your style and budget
acceseries - depends what barrel comes with the gun u get. Un1tec are very good for the price.
im sure this has all been said, but im to lazy to read through the other comments