I just got engaged on New Years Eve and would like to get married Sept 2013 (we're old, we need to get this show on the road! 

.  I am a complete novice about weddings, so I'm feeling a bit overwhelmed.  We got the list to about 60-75 guests and would like to get married on the beach and have a laid back reception (like bbq or shrimp boil) at a rental house.  Our budget is around $10k, and I'm willing to DIY as much as possible.  Any tips for a newbie?  Is this budget doable?  What else?  I don't really know where to begin.