dude , firstly after playing Sweet child over 20 live shows ... I've learnt to hate that song hahaha so learn a diversity of songs man .
What you are looking for is that Slash sound , now he doesn't use much pedals though but here's a trick after months and months of trying and spending money hahah .
Slash uses a low output pickup , the Seymour Duncan Alnico pro 2 pickups to give him that sweet sound , topped with a high gain amplifier (His signature Marshall) But he runs it through a complicated series of 3 other marshall cabs , and i think that includes a JCM 800 and a Sliver Jubilee(which btw is the best marshall amp ever made) .
For his pedals , He used an old school cheapo Boss multi effects pedal to get that delay you hear on 'Welcome to the Jungle' , He uses a Boss Chorus on the entry to 'Paradise city' and his Boss or currently with Velvet Revolver , an MXR 10 band EQ which is set to boost his mid range ( i do the opposite though)
For his solo's , the wah parts .... he uses a Dunlop customshop CryBabt rack mounted wah controlled by an Earnie Ball volume pedal , he has a few of these lying around stage waiting for him to rock that baby back and fourth but he does have his signature wah by Dunlop as well
Its not so much of effects pedals that he uses , Slash focuses on wiring , loads and loads of them .
So yes get a high gain pedal e.g
.
Sweet child of mine has a spring reverb at the start if you notice (its the Marshall's spring reverb), get a good reverb pedal ... I'd recommend the Electro Harmonic Holy Grail cause its cheap and good .
so here it is ,
Distortion pedal , well try the MI Audio Crunch box man that thing packs a punch -$225 but yeah heavy metal then go for the Zvex Box of Metal - $450
Chorus Boss CH-1 super chorus - $135
Reverb , Holy Grail - $200
Delay , Boss DD-3 (good enough la) $150(second hand i guess)
Wah (slash has a signature btw) Jim Dunlop Slash signature wah -$300
Pedals alone are gonna cost you at least $1200
Amps , JCM 800 head - $2100
cabs are cheap , like 800 bucks each
so total , thats gonna set you back by at least 4k total , not forgetting your les paul ( slash signaures are about 4ksgd) yupp so 8k to sound like Slash , oh and you're probably gonna have to try and play like him too
All the best bro , this is to the best of my knowledge