Making your aircraft fly straight at a certain speed with your hands off the joystick is called trimming. Most people do it once they are up to speed. But remember that every speed on every altitude needs its own trim to be perfect. Trimming the ailerons is not possible with a spitfire. This is why it wants to roll to the right most of the time. With the right combination of RPM and pitch this pull can be minimized but gives other drawbacks the same time.
Flaps can be used during take-off to limit the space needed to take-off. This can be useful on short runways and/or with heavy load. Some planes have special flap settings for combat, but most don't. You can use your landing flaps to make an extra tight turn. But the disadvantage is that your IAS (Indicated Air Speed) shouldn't be too high to prevent damage and that you come even slower out of a turn. However it can be useful in some situations. Using flaps in combat situations is typically for the more advanced players.
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