So im going to start sweep picking. Would it be good if i started with triads and then when i master those to move on to sweeping arpeggios of full chords?
A triad is a "full chord", it is not limited to only 3 strings. However, you can just start with 3 string sweeps and work your way up, yes.
Gibson SG Standard
Ibanez S2170FB
Peavey JSX
Marshall 1960A
Learn to construct arpeggios as groups of notes, then you can construct your own sweep shapes, the important thing is that you start off with simple three string shapes.
R.I.P. My Signature. Lost to us in the great Signature Massacre of 2014.

Quote by Master Foo
“A man who mistakes secrets for knowledge is like a man who, seeking light, hugs a candle so closely that he smothers it and burns his hand.”

I started by sweep picking chords. After that, I learned some arrpegios.
(but I already know my theory very well so it wasn't hard to find the notes)