Hi
If this is truly your first go at H2o, keep it simple; less can go wrong and you will pick-up- some experience along the way
Lot's of tutorials on youtube, a good starting point is a simple T line CPU loop; T line acts as your reservoir (helps to keep the noise down) and will help keep the cost down.
nb: something that you need to be aware of when starting out, it is not maintenance free and can cost a lot of money in tubing and coolent. You will also be invalidating you warrenty for any parts that you fit water blocks on.
I appreaciate erocker has suggested using compression fittings as they do look great, however as this will be your first build you may be better off with EK barbs & hose clips. If you do use compression fittings make sure the tubing you use has the correct wall thickness
Be aware the only things that are an investment and are reusable in the long term is your Rad (get a tripple 120, these fit in or on most cases and you will not have to have the fan's at full blast to keep the loop cool) and fittings, Tip, if you use 1/2'' tubing get Tygon, it is slightly more expensive but very flexible and dose not attract algae quite so much as it is laboratory grade
take you time, do not hurry when assembling your PC
I wish you all the best
Law-II