What the f$#*& do i do???

Our reception venue has cloth service but nothing for deco. On a HUGE budget which im struggling with big time. I didn't realize how much money went into the little expenses including hiring a company to bring a mic to my service for 40 bucks for half an hour and paying them 200 bucks just to take it down? I AM FREAKING OUT. what kinds of things should i do to make it "ours" for super cheap, and should I do flowers? If so whether fake or real? Im so lost in this planning thing but i want to make it as beautiful as I can for as little as I can. I mean as little as I can. Im not rich by any means. Im a young mom and we both live paycheck to paycheck. Point is we love each other and are dead set on this happening (especially since invitations have already gone out) We do have the means to do this but at the same time it needs to be in our range. What kinds of things can I do to make this amazing without spending EVERYTHING I have? (fyi dress and photogropher were paid by my parents) Aaahhh!!!!