Im 18 and curious on how to transport a p80 in my truck with no serial number (gonna be built by myself once looked into more and is strictly for personal use)

I’m wondering how to legally transport a p80 Glock 19x that I’m wanting to build all by myself, I’m 18 and I know Florida laws for 18 year olds concerning handguns have gotten stricter since the 2018 shooting, I’m wondering how and if I can legally transport it, if legal for me to have in my vehicle, I will have fishing rods with me at all times as I do fish a lot but I also am wanting to bring into my work as my work place is firearm friendly and everyone carries at my work, I just want to know what to expect and if getting pulled over will be a problem if they ask if I have a weapon in my truck, and if it’s risky as the p80 comes with no serial number, I’m thinking of putting a custom serial number with my name and a personalized serial number under it as I’m not planning to transfer it to anyone and is only for personal use, but I don’t know if there’s laws that prohibit me from doing this, I’ve never been pulled over either and it’s gonna be new for me concerning this all, if anyone has any knowledge on this and can help me, I would appreciate the advice on this!