Not an expert in any of these planes, but this always does good for me:
If he's talking air to air, then for 109s: G14 for starters, and as your gunnery imporves, the K4. Get in to about D300, or even D200 if possible, to use the 30mm cannon, as the balistics are just terrible. Use a light trigger finger as the 30mm ammo goes fast, an 2 .50's aren't going to knock anything down in a hurry. 50% fuel and DT's are good, and use only the 20mm in the G14, and leave the gondolas and rockets in the hanger.
Your in the wrong plane if your looking for a ground attack, its a one shot deal.
For 190's: A5 to start with as (IMO) it is the best starter plane out of the 190 set. The A8 just seems to wallow in a fight, and since newbs seem to wana turn, your going to be trying to tighten a bolt with a saw as far as the "a plane is a tool to use" issue goes. 50% fuel with the 190's always seems good to me, and as for the gun options, take the 4 gun option, but RTB every kill if you spray and pray, as 90 rpg goes fast. Oherwise head back when you see a sudden drop in the bullets your putting out.
For ground attack, I'd take either the F8, as its the best of the series, or the A8 as you have the options to take 4 20mm's, or 2 20mm's and 2 30mm's. Great for strafing, but ordanace is more limited.
Just general advice, keep the fuel loads light, I take 50% at the most unless I know its going to be a long flight. And get in close, D500-D300 is best.