There is a lot of information missing for anyone to give you a decent answer. Which os you will be using? Which browser? Is it for you only, or you plan to sell/share it? so many things..
Whatever language that might be right for you, and assuming it's a desktop bot, this can be broken down to 3 stages.
Stage 1. Learn how to make the bot "GUI" and that is rather generic and general programming (i.e you could be building a blackhat IM Bot, or accounting program, the same techniques will apply).
C#, visual basic and java are perfect languages to learn for this.
Things like how you will enter your information, how you will store them, manipulate them and how to present them, or the results.
Like you will have to enter your list of names and other fields. maybe you will need to reformat the lists, sort it, or randomise them.. etc.
Knowing something called Data Structures is very important here.
Stage 2. Adding a webbrowser to your bot. You can easily add IE or firefox or even chromium to your bot and turn it into a browser.
The difficulty level here ranges from easy to complex, depending on which option you choose. And each one has their own unique problems and advantages.
Easiest is to use Internet Explorer, for a beginner.
Stage 3. Do all the imacro stuff, navigate the website, click on buttons and links..fill forms etc.
For this, you will need to learn DOM and knowing javascript helps a lot. Luckily there are many tools to help at this stage.
Once you master stage 1 and 2, google will help you with stage 3.
In any case, 1 month is not enough, i'd say 2-4 if you are really dedicated and your requirements are simple enough.
