Recuiting is one of the time consuming parts of running an alliance. You should think through why would you like to start a new alliance and decide if it is worth the extra time compared to finding an alliance that fits you.
If you want to start a new one, then next step is to set up what type of alliance you would like. Looks like you already have ideas on that. If so, then you are good to go. Recuitment happens on AR, forum, Line, Discord, FB, Reddit - but you might want to start with a smaller scope and a few arenas. Once you have a group of good co-leads you could extend.
Be clear with communicating what you offer and what you are looking for during recuitment - save time for yourself and the people. After recuitment, be consistent with applying the rules that is agreed/set up in the alliance.
I would also recommend to choose a name that is easy to find in alliance search - not some weird spelling and not something there is already 6000 of.
Good luck!