Java program design model

i think i need help. Through my experience i've learned that in coding field designing and modeling takes most of the time in a project. i wanna build a comment generator.. so here's a step by step process on what i want to achieve: 1. i wanna use a joption to ask for the username, which i want to be stored for the entire time the program is running for continuous use.. then use a yes/No confirmation.. 2. after confirmation the frame should pop up.. i wanna add a few Jtextfields, Jbuttons, Jcombo, Jdatepicker and a Jtextarea to display the final comment, which is generated from every input from the user.. 3. i want the display to be a method using printf format, with a sentence using format specifiers for each user inputted data and the systems current date.

I designed a oop model i was confident with but i ended up being confused, when i started coding. i work in a small company, i saw that making this tool would make our work much faster and accurate. its small but i wanna build it with high level design quality and extremely readable.. can someone please help me figure out a model or design pattern for this. how much classes should i declare, etc... your advice would be greatly appreciated :)