Get a decent ish amp first eva see what you can get out of it then decide whats needed / desirable no point buying lots of stuff you prob wont use. A good guess is a Wah and some type of Over Drive like everyone else has said..
My gut instinct always tells me to steer clear of Marshalls that arnt tube... A Fender Blues jnr is a cool amp for cheap tho (specially used ones) Fender XD Champ has a pretty good marshall esque voice. Epiphone valve jnrs are pretty good too... just my 2 cents I'll post a clip of the Fender XD's marshall sound this week if I get chance...
As for pedals I dont have a terrible lot of experience in dif types because I rarely use them.... Boss DD3 is a cool delay, I use a fulltone 69 for that hendrix'ish fuzz sound, my Dunlop wah seemed like a good buy when I was beginning and its lasted a long time with some heavy use and its always in my rig regardless of what amp / where I am so I cant complain its a good cheap wah .. Ive seen alot of peeps using a Boss OD pedal which didnt sound too bad.