@Keri Win I self manage and use MySmartMove for my background/credit checks. Each adult tenant over the age of 18 must fill one out. You will need their names and email addresses.
I don’t use software to manage but have a few spreadsheets I have created.
If this is your first/only property I wouldn’t overthink it or overburden yourself trying to streamline everything while you’re just starting out.
I got my lease from a fellow landlord that had an attorney draw it up. I have added a few little things here and there that are specific to my situation.
Might I suggest a separate addendum with regards to the septic system that ALL adults sign and covers what you want them to know. I would also include in this addendum who is responsible for what. Such as Landlord will pay to pump and maintain system as needed.
Tenant will be responsible for all charges associated with malfunction of the system due to misuse. (Which can be documented by your septic company if there is a clog or backup).