Figuring out cables would take perhaps few hours (in total, for all components), not a week. 

Start by defining your budget, then take approximately 25% and choose best CPU for that price, and 25% & best GPU for that price. Afterwards, select a motherboard, which can host your CPU (motherboards have CPU-specific chipsets so it is the main potential failure point). When you are done with these main parts, throw in some RAM and hard drive (motherboard description will directly tell which kind it supports). Finally, add a power supply to keep things running, choose some good (though they are usually cheap) CPU fan and select some case to put all the goods in (larger cases are better since they guarantee you wouldn't have problems fitting all the stuff inside). 

Finally, ask the shop support whether the configuration you collected makes sense and whether components you have chosen would properly interface with each other (aka basic sanity check).
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