I have had serveral multi effects systems I now use pedals.
there are advantages to both. I got tired of presets and programing and prefer just to dial in the sound I want on an individual pedal.
Some days I feel like 5 or 6 pedals, some days I don't feel like using them at all.
good starter pedals - overdirve - overdrive can be used to dirty up a clean amp and get a blues or classic rock sound
or it can be used to push a distored amp into a hardcore metal tone. a fulltone ocd - is a very versitile overdrive
- looper - a looper is an excellent practice tool or composing tool and has a few practical live applications also.
- heavy distortion - if you amp does not have a distortion channel at all you may want a heavy distortion pedal. -I use a metal muff occasionally
next I you may want to consider
- reverb - i you play alone in small rooms ( at low volumes) and your amp does not have reverb, reverb can make the amp sound more open
- delay - can add a litte echo to make things sound fuller or more interesting.
get a multi spot power supply - at bare minimum a visual sound 1 spot or similar. otherwise you will go broke buying 9 volt batteries.
I own a bunch of effects however,
I typically use just the amp and barber super sport overdrive when playing with a band.
I use a barber super sport overdive and a electro harmonics metal muff into a tc electronic ditto looper directly into the input jack of whatever amp I happen to be using when I am practicing or writing,
hard to say more without knowing what sound you are going for or what equipment you use.
Thank you very much for your suggestion. well I've learned from what you've commented. well I am planning to buy Multi effects for my first try.. but well yeah I think you're right.
But I always play on bedroom. and I play Japanese Rock or any Instrumental songs. for example "G5 2007 "Words" " (sorry i can't post the link. It won't allow me, just check it on youtube if you have spare time) :)