I want to start trading in Bitcoin to dollar,
but I looking for someone sends me mesages
every day tells me it's time to buy and it's time to sell.
Where can I find this person? 
Nice idea u have here. Did u plan to pay that person who giving u hints? I heard about some bots that do that what u asking for, but they don't tell u to buy and sell u decide that. Also I saw somewhere how its good to follow traders on tweeter and fb (maybe even some other place) and to try to catch their good prognosis.
U should add some more info about what u are asking, and before that to search the internet about it. Regards and good luck.