Please Help Me With My First Build, Almost Clueless With All The Available Options

use pcpartpicker.com

That's what I did, It will let you know what is compatible with what, also tells you what your total watts are up to so you know what power supply you will need!

let's take this one thing at a time;

for video and other multimedia, an i7 is justified; but in almost all other cases, it is not value for money; i'd recommend a non-overclocking i5 haswell;
here is a link with some recommendations from tom's; even though it is for gaming cpus, it kind of covers general use as well;

www.tomshardware.com/reviews/gaming-cpu-review-overclock,3106.html

motherboard: if you dont plan to use a couple of features such as ssd caching and RAID, then you get the budget range B85 for around 5k, otherwise get the the consumer range H87, around 8k; gigabyte, asrock and msi are all good around here, asus is better, but costly;

power: there are online power calculators such as below to help with some wattage approximation, so you can buy the correct SMPS; you just feed your components and it gives out a recommended wattage

http://www.coolermaster.outervision.com/advance.jsp
http://www.corsair.com/en-in/psu-finder

RAM: there are a certain advantages of using a dual channel so i'd suggest you get two sticks of same capacity fromsame manifacturer; just remember to get 1600 MHZ and not above or below it; also getting 4 instead of 2 does not add any peformance benefit; 2 sticks is the perfect number;

cooling: for your needs, i think a box of (four) 120mm fans is good enough; but it depends a lot on your case choice;

lastly, you have come to the right place, so relax and ask as many questions as you want before you make a purchase;

here is a reference build;

12,000 Intel I5 4440 Haswell Processor
06,000 Gigabyte B85M-D3H/Asrock B85-Pro4/MSI B85M-G43
12,000 NVIDIA GTX 750 TI Graphics card from Asus/MSI/Zotac
06,000 2x4 GB 1600 MHz RAM from Corsair/GSkill
05,000 Samsung Evo 840 120 GB SSD
04,000 Seagate 7200 RPM 1 TB desktop HDD
08,000 Dell s2240L 21'5" full HD monitor
02,000 Logitech Keyboard/Mouse/Webcam
02,000 Creative Speakers
03,000 A good UPS
03,000 Cooler Master N300 ATX case
03,000 Corsair CX430 PSU
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66,000 half lifes contemporary PC
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Notes:
- You can downgrade to a H81 to save around 2,000 but it comes with a pcie 2.0 which is non ideal for your graphics card
- You can stagger your puchases for the peripherals such as speakers/webcam etc. if it is going over your budget
- There are newer cpus, and boards, but these ones are not that different from the newer ones and so are better value for money
- prices are indicative only and buil suggestion is a reference only