#1
I started to think that i wanted to get some recording equipments.
I've made a couple cover videos on YouTube.
I connect the amp directly in to my computer.
It doesn't sound that great. (check out my video)

and i did some research and got some info about recording.
I need a interface and a mic.
My budget is around $300.

these are the equipment that i picked.

*Focusrite Saffire 6 USB Audio Interface
*Shure SM57

ARE THEY GOOD?
ARE THERE ANY BETTER AND CHEAPER ONES?

can i record electric guitar(mainly), and some bass,drum,and vocal with this set up?
Ibanez S570B WH
Peavey vypyr 30
Focusrite Scarlett 2i4
#3
any other thought ?
Ibanez S570B WH
Peavey vypyr 30
Focusrite Scarlett 2i4
#4
what FireHawk said.

though your signature says Peavey Vypr 30.
you don't really need to mic that up. you can just go direct.
same with bass guitar.

for vocals, an Audio Technica 2020 would do well.

for drums, you'd need more inputs and a handful of different mics.
you might be better off programming them.
#5
for my previous video on YouTube i directly in to my pc.
and i doesn't sound that good
Ibanez S570B WH
Peavey vypyr 30
Focusrite Scarlett 2i4