If you search the Spartan Games forum for painting tutorials you might find something. I don't know of any specifically but I do know that there are a number of folks on there that put together both written and video tutorials. If the search function doesn't work try just browsing the hobby sections of the appropriate board.
Generally Spartan Games models take really well to a --- basecoat, wash, drybrush, detail --- painting method.
I'm not sure the last time you painted miniatures but the paint ranges for various companies have really progressed over the last 5 or so years. I'm personally a fan of the Citadel paint range (I know a lot of people will burn me for that). Their washes and glazes are possibly the best advance in painting technology to happen...ever... They also have a specially formulated drybrush range of paints that save a lot of waste.
I'm sure some of the other great painters in this community can chime in with advice and tips/tricks as well, so I'll leave it at that for now.