I know Suppressors are not allowed in Kali, so none of those for you. I think MGs at least are OK.
First you find what you want to buy and then the dealer will help you process the paperwork. If you have a clean record and can own a handgun you should have no problems.
Basic process is you fill out a few ATF transfer forms, submit fingerprints and photos, send them $200 for the tax and wait for them to process it all. Once you receive the forms back approved with your tax stamp, you can take possesion.
Living trusts, corporations, etc. are legal "persons" under the law and can own property, including NFA firearms. The advantage here is the ATF form requires your "Chief Law Enforcement Officer" to sign the form stating he kniows of no laws or reasons to deny your application. Many Sheriffs and Chiefs simply refuse to sign (they are not required to do so) because they don't want civillians to own these firearms. In that case, if you form your own "legal person" to buy them for you no signature is required.