There is no way that you can do anything else without knowing how much money you have to spend overall, and then breaking that down into allocations such as conference venue, materials and speakers' fees.  Stick to your budget, and if you delegate responsibilities, make sure your assistants are adhering to their monetary limits as well. The budget might be influenced by whether or not you want to try to recruit sponsors for your event. Sponsors pay a fee to support the conference, but also get a say in the content of the conference itself, typically including hosting presentations or panels with their own speakers and branding conference materials with their logos. On the plus side, a sponsor pays you up front, which gives you more money to work with as you plan. Sponsors might include local industry leaders or philanthropists, depending on your topic. Some conferences are free to participants, and others charge exorbitant fees. There are several factors to consider when setting the ticket price and determining how to begin selling tickets:  What are the fees associated with conference planning? If it is a small, local conference with little or no fees, it might make sense to not charge people for attending. Another option is to allow people who present to attend free, while others pay a small fee to cover conference costs. Multi-day conferences or those that serve meals typically charge registration fees, which can vary from $30 to several hundred in the United States.  Many conferences use a sliding pay scale for people in different stages of their careers. For example, academic conferences typically charge a lower fee for students than for faculty, and also charge a lower fee for members of the sponsoring association than for the general public. When scouting locations, keep in mind the number of participants, the convenience of the location, parking and proximity to public transportation, airports and hotels.  Your goal in finding a place to hold the conference should be making it as easy as possible for...

TL;DR in Indonesian:
Buatlah anggaran keuangan. Tentukan harga dan cara penjualan tiket. Putuskan lokasi konferensi. Manfaatkan bantuan personel yang bekerja sebagai staf pengelola gedung pertemuan. Tentukan menu konsumsi. Sediakan waktu untuk melakukan pengecekan lokasi.