You will only know how stuff sounds together by experimenting and playing with things. TRUST ME, you will change stuff, you will find stuff that sounds better/worse, orders your prefer better than others, etc.
Unless you plan on spending a boatload of cash at once, buy the pedal you think sounds best or most fun, and work its brains out. If you love it, keep it. If it's good, keep it or flop it for another pedal. If you don't miss it, you've only paid for one pedal. If you miss it, you know you can find a new one.
My board was gonna be designed and built; four years later I'm still not done...
Good luck on your journey! It's sure to be one.
"A studio recording is perfection, but emotion and passion come only when you turn on the machine and go for the groove."