Hi,
I'm also a beginner (used to play classical guitar many years ago and recently started playing squire strat.
My advise to you would be that:
Avoid spending time and money trying to achive Slash tone. Most of it is the way he plays. He spends 9 hours a day playing guitar - thats why he sounds that good.
Spend your time learning to play and practice.
If you really insist on getting tone like him - try WAH pedal or better bang for your buck - buy a modeling amp like peavey viper VIP 1 which has tons of amps and effects with it.
Eran.