Modification /addition of telegram bot

It is necessary to finalize the Telegram bot for a company that is engaged in accounting activities.
With the ability to collect applications for it.
We will provide a list of questions that will need to be uploaded.
We need a person who has already made similar bots and understands what nuances need to be taken into account.
The opportunity to evaluate such a bot is welcome. (past works)
In the offer, specify
1. The cost of the addition / refinement of the bot and its content.
2. Timing of the work
3. What additional costs can "float" - subscriptions, and so on.