I think this is my main prob. I havent really trained many of my crews past 75% due to not having enough coin for it.
How can I train them in different things?
Crews perform much better when you get them to 100%. The low tier tank crews never really spend enough time in their tanks to get 100%. Unless you leave them there. Anyway here is how it works. Normally you get a crew that starts at 50% when buying a new tank with crew. Now, you have two choices. Grind the crew up via battles. Over time they will reach 100% in Training. You can get them to 80% at start by using credits to pay up their training. 20k creds per crew man I think it is to get 80%. If you have gold you can pay them up to 100% training if you want. This will cost as much as 200 gold per tank crew man. I think at some lower tiers its 100 gold per man. Now this is just crew training for the tank itself. There is a second type of training.
Once each of your tank crew men reach 100% in training a second set of training can begin. These are what are known as skills or perks. These skill/perks also go up to 100%. Some skills/perks will start giving you benefit as you level up others wont kick in until that skill/perk reaches 100%. For example repair skill starts giving you a benefit right away allowing your tank to repair faster as it gets closer to 100%. Six Sense for example isnt given to you until you get it fully to 100%. Once your crewman is fully (100%) trained in Repairs, for example, then you can begin a second skill/perk line for him. You can keep doing this for every tanker you have. You can have all eight skill/perks eventually. This does take quite a bit of time however. Each new skill/perk line takes longer to train up than the previous line. Typically once you progress a crew up a tank line you should have at least two or three skill/perks per crew man at Tier ten.
This is the basics. I hope I didnt leave anything out. I'm sure someone will correct me if I did. If you need more detailed info just ask. Everyone here is pretty helpful when it comes to questions. You should also read the Official WoT Forums. Lots of great info and tips there.
Oh, and you may be wondering how people in low tier tanks have so many skill/perks? They been playing that tank for a long while. Training the crew as they go adding new lines as each is maxed out at 100%. One thing to keep in mind is even at Tier 2 about half the players are experienced players with many tanks in their garage and full knowledge of how the game works. Other half is the newbs trying to figure the game out.