I think the best place to go for mobile operation help and advice is, like Nathaniel mentioned earlier in this post, www.k0bg.com
Are you currently on HF now? If so, I think 14.185kHz is one spot the mobile guys hang out on. You may want to listen in on that frequency (I don't think you can transmit there as a novice or a general), copy some call signs, then email the guys who are into mobile operations and ask for help. Some mobile ops have great signals. How they do it I don't know. I'm into base station operations. Playing radio in the car doesn't appeal to me.
1991 FJ80 converted to an HDT with an A442, Safari intercooler, 3" exhaust, factory Toyota subtank, 3" lift, 285's, Warn 9500xi, rear drawer system, 42qt Engel fridge. This rig is SOLD!