It's the best thing to go after what is your passion and the road of the process can be enjoyable to you because you like to do it. Wish you the best possible experience, quick learners can go far in the world of trading, good luck.
No problem, I have never used it, I prefer to modify the positions myself as the trade goes on, since I don't trade all day long, when I do I am watching the whole thing full time.
With this particular subject, I can only say that keeping a realistic expectation is very important from the get-go as it has to be with consideration of your risk tolerance. As for the distance, I would say is entirely dependent on the pair and asset that is being traded on and how volatile it...
I can mention a couple of brokers, but you will need to choose one that suits your strategy. What exactly do you mean by added value though?
Spreads, commissions, and better fees?
That depends on how much will you be increasing the size. A losing trade doesn't necessarily mean that you will end up on a negative overall, so it is sometimes worth going a bit above and beyond what's safe.