SFP ports are for fiber optic WAN, but if you want to use a normal RJ-45 ethernet cable, then you will need a standard SFP to RJ-45 adapter, such as THIS. It can be any standard 3rd party SFP adapter, but there might be some SFP adapters on the market that are designed to be compatible with specific devices. The recommendation is to avoid such adapters.
Also, keep in mind that both, TSW200 and TSW210 support SFP, but not SFP+.
If you decide to use fiber optic and you are connecting to ISP, then you will need to consult your ISP to find out what fiber optic connection is used. For example, Single Mode (SM) or Multi Mode (MM). Then you will need an appropriate SFP transceiver for that mode.