Pricing venues

Thanks to everyone who so far has responded to my questions! So, I find the pricing for venues to be confusing. Some include more and do seem more expensive yet other venues that seem affordable don’t include the dj, flowers, photo etc. we likely have a close friend doing wedding photos as he does that anyways for work and our friend will officiate. So that leaves dj, cake and flowers not included. Can anyone give me an idea of what a dj or flowers and cake cost in southern or central CA? I know it depends on many factors such as size and how fancy one wants things. Say a dj for the reception maybe goes 4 hours including eating time. Our venue if we pick it is highly decorative so I don’t think a ton of flowers would be needed. Small wedding, 42 guests max só cake would not be huge. Any ideas? What did you guys do for music when walking down the aisle? Did you hire someone for that or simply play music? I also don’t know how to go about hiring a coordinator. Should I? Living in another state from where I’m getting married, it seems a smart choice to do that. Not sure how to pick a coordinator. Thanks everyone.