At least 90% of my meets include some degree of roleplay, from short and simple to set the scene, through to relatively long and forming a significant part of the experience. I also enjoy dressing-up and roleplay in non-sexual social activities. (Rightly or wrongly, I consider myself something of an expert!). Here are some basic tips for beginners.
Start with something short and simple, then if it's not working, you can forget it and transition to a normal meeting with little lost.
Choose something that the SP explicitly offers in her profile (schoolgirl, secretary, neighbour, etc. are common), so that it is a role she has played before and knows what is expected. Avoid escorts that include roleplay in their likes list, but give no idea as to what roles thay enjoy.
Include the scenario in an email/text/whatever, but keep it short (3-4 sentences). A complicated plot is not desirable and no-one wants to learn lines.
Get her to wear a costume, even if it is easy like for an office roleplay, and wear one yourself, even if just putting on a tie or similar. This helps get you into playing a different character.
Don't worry if it doesn't work; this happens. We have all been in roleplays where one or both parties have collapsed in fits of giggles due to the silliness of it all. Take a breath and pick it up again, or forget it and move on to sex. As ever, you are there to have a good time. It is not a chore to be endured. If necessary, change tack and do what you prefer instead.