Promotion bots are of two types one are bid bots and other are bots like minnowbooster and If you are new then i,ll prefer minnowbooster because it is a bot who help and promote low level steemians and it is a profitable bot.
Bidbots are bit risky because there vote depend upon the bid. more bid they will recieve smaller they will vote.

wish you best of luck and keep using bidbot to promote your post it really helps alot