Hi and welcome here Please feel free to come to us for advice, there will always be grans here that have good life experience and will hopefully be able to help 
Personally I raised my 2 children without any support, I did have a Mum and Mother in law but neither were maternal.
When I had my first son I wake up one morning and all I could see was nappies baby clothes and felt I could do with some help, I called my Mum and asked for help, I am busy she said... I thought that was mean to refuse to help a new Mum but can I tell you it was the best thing she could have done because when she would not come to help me it made me think.. Fine I'll do it alone and don't need anyone. And that's exactly what I did, never asked anyone's advise never asked for help ever again and my husband worked long hours and was old school in that he felt it was a wom4s job to take care of the children so not too much help there and I could not be prouder of myself.
As far as should you have more children.. Well it is such a personal thing.. What would it actually be like having another child in the family, think about what your day would look like, would you manage ok, does your husband want another child just as mu h as you because that is so very important that you are both on the same page.
I personally should have stu k with just one child because having a second child was too much for us and our marriage suffered greatly and never went back to what it was before having my second child
But my son has three children and he couldnt be happier, he feels extremely Blessed, it's hard work but like in your family, my son works from home and helps loads and so they are a team and it works for them
I hope I have given you relevant things to think about and lastly you could also, if you haven't already ask the same question to mums net.
I wish you the very best whatever you decide, just take your time and only go for it once you and your husband together, have thought it through 