I wouldn't really recommend using it all on a whole new account. Maybe spend it on purchasing a really good account?
If you still insist on using it on a whole new account, then here are some ideas. Buy a good ZP character, then go for M4-Patriot, M14Ebr, and Dual DE Pink crates. If you want to purchase high quantities of one crate, then go for only M14 and Dual DE Pink.