If you've already decided on Strathclyde, you should check with them what their start date and application procedures are. As for ideas about topics, I doubt whether anyone can help you with that - a PhD is individual and original research, so it's got to be your own work. If anyone has a great idea for research topics, they're more likely to keep it for themselves in the current highly competitive market. Perhaps you should do a masters first, if you haven't already - it might help you work out where your interests lie and develop your ideas. It is also a smaller commitment in time and money than a PhD if you are also working.
As for your other questions, you do seem to keep asking the same things in your previous threads, so why not go back and re-read the replies, or just browse through the forum - others often ask the same questions, so you are likely to get good advice from them too. Good luck!