Need help with rear shock rebuild

[factoryskidoo]

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I'm getting back into the riding scene after being out for about 6 years. I'm wanting/trying to rebuild my rear shock, or replace with an alternate model shock, but not sure where to start. I got this bike for a steal, and knowing it needed to be rebuilt. I'm open for a walk through on how to do this, or where to even start. It needs to be done STAT. Hit the tinniest bump and I can feel it all the way up to my shoulders. It will literally buck me right off if hit too hard. HELP ! ? ! ?

[suzuki11]

what is the bike

[SHOWTIME]

Welcome to E2S!
Weve got some suspension pros
around here. Im sure you will
get an answer in no time!