The best way to start is just to update your profile. Having a LinkedIn account with a current experience section, summary, and picture can go a long way. When prospects look up your profile before a meeting, they need to get a good glimpse on who you are and what kind of salesperson you will be.
This thread has some stuff on how you can use LinkedIn. (LinkedIn for Sales)
If you have any, you can include product videos or presentations on to your profile so a prospect can easily look at your product and what you will probably offer them when you meet them.
Make sure to be active on your profile! You can either share some of your company’s content (like blog posts, videos, or articles) or post something that you find interesting about your industry. It is also helpful to stay informed on your connections. You can like or comment on things that appear on your feed and make even more connections that way.
Join some LinkedIn groups and get involved. You can ask questions or answer whatever you can.