Kiran I recently shot at a wedding as my daughters were flowergirls. Thank goodness I've also decided to not participate in this any further as anything more than a hobby as it was a complete failure.
Churches are dark and dingy places and nothing but high end equipment will suffice. You also need plenty of spares (batteries, memory cards, flash, camera). Throw in patience too
Here's my terms should anyone plead with me to be their tog at a wedding
Minimum charge = $5000 (I justify this because I would want two other shooters and there's at least a weeks worth of editing time, interview time, working weekends (3 togs remember), travel to & from, Bridezilla (AND her mother)
NO MOBILE PHONES and no photography by anyone else at the church, I would have this written into the contract. I couldn't get a decent shot of my own daughters due to everyone being in front of me with their phones or compacts, any shots or footage i have looks utterly ridiculous
Insurance (incl public liability)
Labour (both on the day and editing time)