If you are a small business with limited funds it is easy to get overwhelmed.
Some web sites are inherently more secure than others. The websites that give you the most flexibility will often also require more back end maintenance to keep it functional and secure.
Communication is key.
If you have a system in place already and it doesn't work well with mobile devices then start your transition today. If your internal intranet requires weeks of training to support; is it really the best tool?