Port forwarding with No-IP via D-Link router

Hi dears,

Firstly, apologies if this thread does not fit here.

In 7 days I will have to leave my home town for 6 months and I would like to set up my OMV5 -rpi3 so that I can access my NAS from outside. I can now access my OMV web page from outside my LAN by using the no-ip hostname (i do not specify any port here) I created. I have created a No-IP account and under the "no-ip hostname" section I redirected the domain I created to my public IP of my home in my home town. In the router setting I probably created a mess:

Under port forwarding: i have set my private ip and open ports from 1 to 445. Should I add more?

Under Application I have not done much:

Under ACL I have modified the ssh setting:

In my OMV5 I have ssh open, and http open

So, how do I ssh my raspberry pi? what is the actual command in linux? ssh root@public-ip -p 22??

How do I access my SMB files from outside? Would it be possible also to access portainer from outside too? I will have access them by ubuntu on my personal machine. Do I have to use a specific software? What would be the command?

Should I secure more my files? using a VPN (I do not know how to set it up, from now), do you recommend me to use FTP rather than just SMB?

Any guide is very welcome, please tell me if I need to learn more on some specific topic so that I can inform myself.

Disclaimer: I am just a self-learner geek so many concepts are hard for me to understand but I am a decent learner, so to speak, so after some troubles at the beginning I can make things work.

Thanks, actually the installation of OMV6, snapraid, smb shared files and accessing the files over internet was so much easier here using sftp and filezilla. Now, I just have a problem with the installation of Docker, but this is another topic.

For the sake of completion, I finally closed all unnecessary ports and left only the ones I needed and SFTP worked after the plugin was installed.