I don't know any tutorials off hand, if I find any i'll let you know
. Youtube probably has the best resources for this or other artists on DA. Me personally, I think that using one, two, or three point perspective is the most appropriate method for conveying anything in perspective properly. Two point is a little easier (i mean it won't take up as much space on your paper) and still does a great job of giving you that "perspective" feel. I often just assume what an angle would look like for sketches. I just have a "feel" for how a perspective should look and is great for getting ideas out but can be horribly inaccurate when compared to an actual constructed view. Another method for sketching could be to take an object like a block and sketch it or construct a cube on paper and then use that defined box to create something more complex like, say, a car.
I hope that this was at least a little bit helpful, I not sure if it was.