I sure hope that Marshall amp isn't an MG series. Not all Marshall amps are created equally. I'd highly recommend a decent modeling amp like the Roland Cube or Vox Valvetronix over an MG series Marshall. Now if we're talking a nice old tube/valve Marshall, buy away.
Ranier Marz. I know that name. He was in Jeronimo and Atlantis for a short awhile I believe. Steppen Wolf is another good one. Seen them twice.
A metronome is basically a device that keeps time for you, like a primitive drummer. You can practice with them a million different ways, but I'd suggest starting out slow, say 16th notes (4 notes per beat) at around 60 bpm (beats per minute). To get yourself loosened up I'd start with alternate picked (down, up, down, up) chromatic scales up and down the fretboard. This will help you built dexterity and picking accuracy. Take your time, you won't be able to shred your first day. I also recommend playing through a clean channel when practicing. Distortion and other effects can hide your flaws.
For scales, start off with your major and minor pentatonics. They are your easiest to learn and easiest to play with. Most rock and blues music is based off the penatonic scale.
Hopefully that made sense.
