what brake flare tool should i buy

I would start with Craigslist and pawn shops. Find an old retiring HVAC guy. You want old school brand names. Imperial, Weatherhead, KD tool, Lisle, like that. I've forgotten quite a few.

You will need the double flare adapters, and if they "don't" you should be able to order them from any decent parts store or hydraulic hose shop

Most of 'em look like this. You must not flare directly after cutting. Rather, ream the end, and carefully file the end of the tube FLAT, then flare



A Lisle with destructions

http://www.lislecorp.com/divisions/products/?product=168

Make sure it's for 45* which it probably will be. Make sure it's NOT for 37* which is JIC / AN rather than common SAE brass / brake (inverted flare)