You are right to be suspicious. This industry is filled with vultures and consultants who, for a fee, are willing to tell you whatever you want to hear. If their advice turns out to be wrong or otherwise worthless, they don't really care -- they already got your money. I've seen many companies ruined this way.

Instead, you should find an experienced person in the field and ask him or her to be a part of your company. Offer them a healthy equity slice in exchange for their contacts and know how. This way, he or she has skin in the game and incentive to have you grow as quickly as possible. By making them a part of the team and given a large equity slice, they are unlikely to steal the idea, as they would only be stealing from themselves.
The really good ones are hard to find. They don't need you. They certainly do not come out to tech meet ups, or seminars or what ever watering hole entrepreneurs like to hang out at. You have to do your research, find them, and convince them that they can make a lot of money by joining your company. IF they like you and the idea, they will do so. If not, ask them why not, and make whatever adjustments they desire.