Marriage Guidance Without an Existing Muslim Family
Every practical part of getting married, from finding a spouse to arranging a wali, still applies without an existing Muslim family. What changes is who you turn to for each part, and building that support usually takes more deliberate effort than it would with family already in place.
The process is the same. The support network isn't.
The questions to ask a potential spouse, the red flags to notice, and the general shape of getting married all apply the same way regardless of your background. See getting married for the fundamentals that apply to everyone.
Build a support network deliberately
Where an existing Muslim family would normally provide a wali, character references, and general guidance, a mosque or Islamic centre with an active community can fill much of that role, but it usually requires actually showing up and getting known rather than assuming support will appear on its own.
A wali is arrangeable, not a barrier
Not having a Muslim father or male relative doesn't mean the wali requirement, where it applies, becomes impossible to satisfy. See finding a wali as a revert for how this is commonly handled.
You're not navigating something unusual
Mosques with any meaningful revert or new-Muslim population handle this regularly. Ask directly rather than assuming your situation is too unusual for anyone to have dealt with before.