We don't answer individual legal questions or give lawyer referrals. Download after purchase. Once you've made an invention, write down the problem and solution involved.
Most inventors usually find that their initial solution can be improved or made more workable.
By conceiving of such improvements first, you can foreclose future competitors from obtaining patents on them. Even if you believe your first solution is the best and most workable, your potential producers or manufacturers may not see it that way. So, it's best to have as many alternatives handy as possible. When you apply for a patent, the more ramifications you have, the easier it will be to make your patent stronger. Ramifications often help you understand your basic invention better, see it in a new light, see new uses or new ways to do it, etc.