I am a day trader and would still wholeheartedly agree with @Johnscott31. You need to start on the longterm timeframes and you’ll be less likely to build any bad habits.
On a second note, all the questions you’re asking could be asked in one, what is your strategy? Unfortunately, I dont know many people who will reveal this to you. There are a lot of people who’ll say it’s easy to find a profitable strategy but not many details. See my thread where I discuss this:
Having said this, there a few threads where people are running their strategies and displaying their indicators which you may want to look into here and here and here. Have a read of them, get involved and get testing.
Start your education here, it includes the babypips course. Good luck!
For day-trading Forex, what are some of the best time frames to look at?
time frames on the daily trading are from M1-D1. The best one depends on the trading strategy which will define entry signals. Use from H1-H4 for the best trading signals.
What are some very useful line indicators to have on your charts when day-trading Forex? (moving average line etc.?)
I am not using any so I will not recommend any
Can you successfully trade just using technical analysis and watching the charts with indicators and strategies?
-yes, you can. That is enough to be profitable. You need to find chart patterns that gives you good returns. Using the charts with support and resistance line should be the base for any trading strategy.
What are some of the best currency pairs to trade? How do you know which pair to look at at what time
The best trading pairs are the ones which have the most chart patterns signals defined by the trading strategy.
If you are beginner then it is the besto to use slow to moderate pairs with 40-70 pips daily average.
If you want very fast trading pairs then you should use GBP/JPY.
Take a look into the chart below that shows the trading pairs and their average pip movement.
I would also advise you not to take such a risk once you are just getting started, but long-term Forex trading is more promising and will give you a wider range of opportunities. Of course you can try gold for example, you can work with it in this format in my opinion, but overall it is more difficult and risky than you probably imagine, so before you start, you can think about something more accessible and understandable, at least for now.