How can I practice social skills before my new school?

I’ve been injured for 6 months now and missed half of school, finally able to go now but I haven’t talked to many people at all so I’m worried I’m gonna be very awkward

What can I do to prepare so I can flow naturally? I’m great at conversation unless I’m uncomfortable or nervous and I wanna make sure I’m not like that

Advice? All I can think of is greet people I walk by, I’ll be going on a 30-40 minute walk everyday