Are you looking for something like an online learning system? Gracehill can help for that:
www.gracehill.com - they provide all kinds on online training courses for everyone on your team, from office to maintenance. If you need specific maintenance skills training, you could contact your local Apartment Association, community colleges, hardward stores, vendors for HVAC parts, etc. I have used each one to provide training to my maintenance teams when there was no corporate maintenance training teams available.