I think I can help you a bit
I made a female Ezio costume a couple months ago. I was completely brand new to cosplay so I was pretty lost also.
Here's what it looked like:
I got A LOT of help from this site:
Basically the guy has tutorials on everything. He also has patterns with measurements so you just measure youtself so it's a custom fit for you.
I altered some of his patterns a bit to add a feminine flair to it but for the most part with all of his tutorials I found it a lot easier.
I made two hidden blades using ball bearing slides. I find a tutorial for that on youtube also.
Everything I did i learned but the internet, it's really an amazing thing
Check out that site and see what you think. Lemme know if you need help on anything else, I'd love to lend a hand