When I write a new recipe, especially for a new brew, I will look at the BJCP information to stay within the "style". I am familiar enough with most of the ingredients, and can fairly well predict what the outcome will be.
For you as a new brewer, please don't fall into the trap of a "chocolate peanut butter, vanilla bean, mocha chip...", well, you get the idea, for your first beer. Use someone else's tried and true recipes. There is no shame in brewing your own version of a recipe that works. There are a bunch of 1 gallon brewers around here, I believe could be a lot of help. If you brew something nasty, you are only losing approximately 5 dollars, but you are gaining loads of practical experience. Just my $0.02.