i got a pretty good mark last year in AQA CS nea so i'll give some advice.
Best thing I did was look at examples from other ppl in the year above at the same school, so ppl who got around 68 etc.
Refer to MrBrown CS and Joe (can't remeber the whole name but he's got a lego pfp, just type nea aqa cs nea on YT) for what to include.
https://www.youtube.com/watch?v=AglgGxB2tO8I think you can find other ppls ones on Reddit somewhere.
Here's a rough list of what to include in Analysis (or what I did but you might need to add some stuff to it depending on your project):
Project Identification, Problem Statement, Target Users (Interview with Prospective Users, Survey (conducted on Google Forms) with Prospective Users, Analysis of Existing Systems (I analysed 3 but this might be too much), Modelling of Existing Systems (DFDs and whatnot), Limitations of your project (what your project will not include), Solution Requirements (what your project needs to succeed), Project Objectives, Solutions of your project (how can your project be created? (list a few ideas and write pros and cons of each) what language will you use? etc.).
That's analysis done pretty much.
One thing I will say is don't stress too much of this NEA, focus more on the papers tbh and don't overcomplicate something. Also, START EARLY. Do a little every day or every week. Don't leave it to the last minute. I slept 4 hours in 4 days finishing my stuff off.
If anyone needs any advice on CS AQA NEA, let me know