My recommendation is to contact Greg Bakke at Expand Financial. 720.387-8158
I would start with the plan advisor provided by your employer. A call to your HR department will get you some basic information and directions on how to get more from the plan administrator. They will be able to get you a list of the investment options offered by the plan and some basic guidelines for how much you are eligible to contribute . They should also provide you with information related to costs and what if any matching contribution is provided by your employer. Once you have this information reach out to a local advisor in your area to see if they would be willing to meet with you and provide guidance in setting up the portfolio in the 401K.