Will there be any pin interference in this Project?
possibly you will face problems with current drain and timing. There is no ready made solution. You have to get a bit farther by yourself and come back with detailed descriptions of your problems.
check on other threads (google) the issues with driving directly a coil. There are plenty of explanations why you need to be careful about it.
you should at least try to do the math yourself, then ask for verification. Try to calculate the power requirements of each component (average, maximum, peak) and add them up for every scenario. The you can report your finding and ask for confirmation/advice.
Sure you can, there are plenty of solutions available, but you have to define your requirements and constraints. Then it's easy to pick one solution (or at least google for it).
Just try to include them in the project and compile them. It's fast and you will get the answer immediately. There are ways to optimize things, but first you should assess if it's needed.


All in all, to get more help, you should show more in detail what you have already done, what are your concerns and why.