Buying MAC Online

I went to MAC’s website
M·A·C Cosmetics

I went through the entire site and in fact i liked many products, but i am so unsure which colour is right for me and which isnt. I am so unsure that what if i buy something and when i get it, its a totally separate colour.

I dont want to buy from here in Lahore, because there are no proper makeup counters with professionals who can really help you properly and secondly, i am not too certain about the originality of the product.

I want to buy MAC studio fix powder and a concealer but i am so unsure which colour would suit me. I have asian skin that too more to the wheatish side. Its oily in the T-zone. It is blemished on the cheeks. I know its very difficult to decide by looking a picture only, but if some one who has tried MAC foundation/concealer can just short list 3-4 codes on the concealer & the foundation, i may be able to decide which one to go with.