For what it's worth, PSO-World has a nifty guide on maxing your stats. You'll be using a combination of Materials, Mag and Units to accomplish it. Newmans can't have all of their stats capped at once, so a good build should allow you to switch your Mag and Units around to cap different stats, to suit your mood (I've personally got a HUnewearl build that I've been working on, which, when trading between three different Mags, will cap ATP or MST, or balance between the two). PSO-World's guides
are a good place to start when planning your build. Here
is the guide for maxing out a FOnewearl.
If you're playing PSOBB, then you've got a few more options in terms of units which will make it easier to get your stats up to their highest possible values, and it may even be possible to cap all of your stats. The Item Database
is another valuable resource for this.
Personally, I suggest using Excel or OpenOffice.org Calc to do your math for you, and the Character Manager
available here on PSO-World is a useful tool, as well, for establishing your goals, and keeping track of the materials you've used.
I hope I didn't just overwhelm you with information, there. This is where a lot of the depth of PSO's gameplay is, and it can be a fascinating bit to tinker with. I hope you find the tools useful; thankfully, many people have sought to do this before, and as a result, there are all sorts of resources available to assist you.