lets see..
for landscapes some thing along the lines off a 28-135mm lens or a 20-35mm wide angle lens

shutter switch... tripod (a good weighted one so it doesn't move in the wind)
a polorizer to stop sun glare and add contrast to pics
Nd grads for landscapes.... would not recommend the cokin filters (lee grads are better)
ND filters for long exposures
i carry too many lenses really but find if i havent got one with me then thats the one i need .... so a bag you can grow into is always good... my lowpro bag is sat in a cuboard as it gets used as a day bag for short trips.. mine was too small for what i needed

you need a landscape or a standard lens
28-70 or 18-55 ... ideally the 28-135 if you have the cash (most standards will do your portrait photography as well and your landscape
for wildlife 75-300mm lens
that would do you for starters i would have thought

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