Before you begin your systematic review, you should write a review protocol. Protocols are important for the following reasons:
You can refer to PRISMA-P (PRISMA for Systematic Review Protocols) which is the standard for writing a protocol.
The Prisma-P is an extension of the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses). It consists of 17-item checklist published in January 2015 for developing review protocols.
Steps for writing a review protocol:
You can register your protocol with the following organisations, Follow their instruction on preparing your protocol for submission where available.
This is also a place where you can find on-going systematic reviews.