Im just reading through it all. You pictures look great from what I have seen but it's actually getting those bookings, setting your price at such a rate that it's competetive and you seal the deal. I wouldn't advise quitting work to start this business. I would work at doing it on the weekends to begin wth, which is when most weddings are. It will take years I think to possible build up regular business.
You need to advertise. The best thing so far if managed well is adwords. This can spiral out of control tho and can cost anywhere of $60 dollars a day. I may be wrong but you really have to have it running all day, because you could decide to run it say from 10-2 but come 3 o'clock you've then missed a client who would have booked. My aproach so far is to put any deposits for bookings back into adwords. It may cost me $400 a month say, but thats the cost, the profit may be $1200 so it's worth it.
Your cost for a bridal shoot does seem very very high.. My goal for this year if possible, is to enter some comeptitions if I win, I can then call myself an Award winning photographer bringing some prestige.
If your only means of support at this stage is your photography business, then you CANNOT quit your job until you are making enough regular income to support your day to day living. Start as many other photographers start, at the bottom, reasonably priced and working a normal job and doing weddings at the weekend. Maybe forget about the Bridal shoots for now.
All the best