Normally, I would suggest doing everything possible to just gut out the 60-ish days until the separation agreement is final, and then file the very next day. However, given that your WH feels no remorse at all about blowing your money for his own selfish needs, over the needs of you and the children, I'd pay to have him served AFTER I changed all of the locks on the house. At least once he's served you can legally go after anything that he blows AND get a forensics accountant involved to chase the money down and see if you can negotiate you being paid that back by him getting less of your assets.
I also highly recommend that you go down to the Separation and Divorce forum and start posting there as well. They have all been there, done that, or are in the process of it, and can give you some great advice. You don't have to leave JFO! You can post in both places for support!