I’d recommend using unifi/ubiquiti switches. They’re a bit pricey but they’re incredibly solid and you can manage them with a self hosted container of unifi controller software.

A good place to start is one of their 8port POE switches. I have a couple and they’re L3 switches (so you can do VLAN stuff like you want), and I’ve never ever had a problem with any of them. Even with the inexpensive ones their POE budget is pretty good, and great to power other switches or APs. They don’t power some cameras so you might need injectors for some thirsty gear.

The controller software is pretty good, and will let you manage the switches without getting into command line config at first (which can be a crutch so be cautious of that, especially if you want to branch out into other cheaper switches or take advantage of good 2nd hand gear deals you find).

But for your network I think an 8 port and a WAP are a good place to start. Get away from using your combo router as your wireless AP (or use both) and get some VLANs set up, and work on inter-VLAN routing and firewall rules.

How do you want to segment your network?

I recommend you have the following to start:

-management VLAN

-trusted devices

-guest/IoT devices

Just getting those three set up correctly will teach you a lot and let you environment. Firewall/routing rules to allow connections through in certain directions and not others is… fun to get the hang of if you’re new.

What are you planning on using as your router? Your combo router might tie your hands if that’s what you plan to use for everything. Combo routers generally suck at everything. You can get a cheap router also, edgerouter er-x is a fine choice but it’s not the best, but it’ll still outdo whatever you currently have, I’m sure. Put it behind your modem at your network edge and you can manage your vlan routing and your firewall on one device.

Additionally you can set up a VPN server on one of your PCs and set up static routes to allow you to tunnel in and access your network when you’re out (wireguard for the win).

Good luck on your journey! There’s a lot to learn so don’t get frustrated then your stuff doesn’t work. Back up your configs so you can revert back and be REALLY careful because it’s easy enough to make your stuff insecure by trying to make stuff work. Yeah it’ll function but next thing you know you’ve got a ransomware virus on your entire network… Not fun, I hear.

As you set up your VLANs look into VLAN traversal, it’s a means of network attack that allows attackers to cross over from one VLAN to another when you set up trunk/switch ports and VLAN tagging incorrectly. Again, your stuff will work but it’ll be vulnerable (not really a problem at home as long as your firewall works fine but still).

Edit: you can go with a router with several ports but I’d recommend you shy away from that if you have the money for dedicated devices. Routers are better at routing (L3) and switches are better at switching (L2). Their guts are built for different things and your network will be much faster if you use them for their intended purpose.