I want to start a signal service but I have a few questions :
Thanks for helping me out, folks ;-)
1. Of course you can enter your orders manually.
2. Yes, if the signal subscribers tick the appropriate option in MT signal settings.
3. Yes, you can use any broker but you should know that there is the problem of slippage between brokers (signal provider and subscribers), so you may encounter slippage problems with some.
You can make a research for this slippage issue, within existing signals and see which brokers show the best slippage values for potential subscribers.