How do you know what to do/decide, among many informations & opinions?

I admit I have a huge problem with this one (and seriously want to tackle this problem completely, since i’m not young anymore, and need to start handling life very seriously, so not to be controlled by my current sucky life’s circumstances)!

example: i always know where I want to become in life, but then, the problem always seems to be i always have so much hesitations & questions & confusions to just start DOING it.

it usually goes like this: let’s say I know I want to start a personal-development blog. but since I’m new to this thing, I’m looking for such informations on the internet, ie: how to create, how to design, etc.
But the problem is, sometimes I browse endlessly (and it is endless!), constantly searching in forums & discussion boards & websites etc on the BEST way to do it.
It sucks up my time so much, and what’s worst is, at the end, after an endless searching for other people’s opinions, I usually just felt more overwhelmed by so many variations in the opinions (why i can’t just realize that each person is different?), and even comes out more confused!
and then..I would browse, browse again, and after a week, will suddenly forget about that blogging thing, and continue searching for the perfect, best plan that will maximize/leverage where i want to become!

I have to admit, that maybe it’s because such tremendous fear/pressure of being a 27 yrs old (soon to be 28 yrs old), and all that ever-increasing parent’s expectations (and here in Asia, it’s kinda a tradition i have to follow my dad’s footsteps or business, which i really hate it or have zero interest in it),
and thus, comes the need for searching that PERFECT “how to start” plan,..while ironically, it only makes me felt very overwhelmed because of too many informations (on the internet especially), and opinions (sometimes even contradictory ones!), and just generally don’t know how or where to START!

for those of you who’ve done a LOT of things in life, and this includes from most, very important thing like: what to choose/do in career (and make money to feed the stomach), how to speak to your parents if you don’t agree with their decisions, until the ‘not so urgent’ one like: starting a carpentry, start teaching, start the bookstore or library business, even planning to skydiving, etc.
HOW or from WHERE i should start?
how do you manage/able to seek for informations (especially if you’re new to the thing you’re about to to start/do), and not getting drowned in the seemingly endless sea of informations and people’s opinions?
how to also KNOW the right/correct opinion to hear, and the wrong opinion to hear?
and how to STOP looking endlessly for that perfect plan or answer, and able to just DO it? (easier said than done, at least for me, who often have such complex thought process!)

bottom line: how do you know where to start,
and how to really start, just do it, and stick with it?
thanks!