My amp (Marshall DSL401) doesnt have a headphone or line out socket, but on the back it does have Speaker Out. Would I be able to connect this to my Pc for recording??
~ My Gear ~

Gibson Les Paul Studio in Alpine White with EMG 81/60
Fender Stratocaster
Marshall DSL401
Boss Metal Zone MT-2
Boss Super Overdrive SD-1
Boss Noise Suppressor NS-2
Digitech RP80
Samson Wireless
Fender Champions Series 30
That's a really stupid idea, I think. That would completely fry your soundcard.
Actually, even if you did have a line-out, without cabinet modeling it would sound horrible. Just buy a mic.