Hiya and welcome
In the absence of our moderator and foundation-mixing genius, Jen, I'll try and help a bit. It's 2am here, so this is a simple answer, but I can try to help some more tomorrow unless anyone else turns up. You look like Buttery Gold would suit you. It's got a yellow-ish undertone, that's good for neutral to warm on pale / fair skins like yours (and mine) where there isn't a deep skin colouration. It's pretty forgiving. Your skin looks great, so if you're not wanting too heavy a coverage (you don't look like you need to cover up blemishes so much), then the original or medium coverage formulas will probably suit you better. The foundation is really easy to adjust to suit - I know it's a bit daunting at first but it's really easy to figure out. I'm guessing maybe 8-10 scoops of Ivory (the white, colourless foundation base) for every one scoop of colour (buttery gold). If that's not quite right, just add a little more white, or colour, and mix it again. (Something like a jar with a lid you can put the powder into and use like a shaker-blender is easy, everyone's got their own ways to do it).
For eyeshadows, the Geo Collection is a great way to do warm neutrals. It's a copy of Bobbi Brown's collection and those are so flattering. Here's a set of swatches of colours, including the Geo Collection named individually:
http://www.silknaturals.com/callouts/sh ... tches.html It's quite out of date, in the sense that there have been a lot of new colours added to the range since then, but it'll show the ones you're asking about.
As for Finishing Powder, there's a lot of options. Do you want something to mattify and reduce oily shine, or just a simple 'finishing touch', or is your skin a little dry through the day? Do you want a hint of glow (Tempt Tryst or Liberty Glow, for a touch of extra but subtle glow)? Perfecting Powder is the best place to start if you're not sure.
Sleep in a Jar is great for concealing darkness around the eyes, especially under the eye and on the inner corner. I use the Extra Light Peach and I'm a little paler than you, so I reckon you'd get away with that or the Light Peach, or of course the yellow. Yellow is really useful for fair skins as its a good multi-tasker. Yellow neutralises slight redness, if you ever have problems with that.
... and a real secret star product of the SN line is the lippies, in particular the Black Label lippy. If you're interested, try the Pure (clear) as it's colourless and unscented, a lovely nourishing, moisturising balm that's unmissable.
Have fun, and ask if there's any advice you need.
I now have a few more things added to my wish list. 
