This will be a little more difficult indoors unless you have a high enough ceiling and plenty of room that you won't break your wife's (or husband's/Mom's, or Dad's) special glass pieces or TV. If you have a garage and you can move your car into the rain to give it a good washing then that is probably what you want to do and you can kill to birds with one stone so they say.
There are a couple things you can do indoors to work with your swing but I believe the most important would be working on your tempo.
If you can get your tempo to be consistent and smooth then you can apply it to every club you use and it will help lower your score on the course. Golf is about tempo and timing. If you have that in place then you can easily observe the distance each club carries the ball in the air and you can have easier determination on what club you will use for each situation.
To work on your tempo the following is what you need:
- have proper posture
- feet at least shoulder width apart, spine angle about 8 degrees (depicted on left of picture to right).
- knees slightly bent
- back spine straight at angle below.
- Balance. The weight of your body should be reflected on the inside ball of each foot.
- Rhythm. this should be smooth going in your back swing as going through to your finish.
- Tempo. This is the movement like a grandfather's clock pendulum going back and forth.
Of course you don't have to wait until you are stuck in doors to work on this you need to work on tempo all the time.
Tempo is not enough, all though, with tempo and balance you can have a few swing quirks that can be hidden. Follow my blog and later you will find swing techniques on helping improve distance and power without swinging hard.
Until then, with a smooth and steady tempo, your game can become consistent no matter what level player you are.......