There is no way to fully automated the system on a BUDGET, you need money to do so.
Yes, you can close deals by virtually wholesaling, but to do so, you need someone there that is actively doing things in person. Same if you are wholesaling locally
Here are my answers to your questions
1) For Budget-friendly tools . Excel was my first CRM, but Podio will let you have I think 500 leads for free to get started. For low-cost lead gen - driving for dollars. For low-cost marketing - use your own printer or Click2Mail. For low-cost phone system - Google Voice. For low-cost deal analysis - use excel, I still use it to analyze all my deals, but I customize my own spreadsheet
2. Scaling on a Budget: talk to 35 sellers a week directly; pick the right marketing strategy based on your budget. Paid for leads or go to the county records and download the information yourself, there is no other option
3. Networking on a Shoestring: I am old school, and most cash buyers are old school too. I have never met a cash buyer in their early 20s or younger. So attend all real estate events in your local market and network face-to-face
4. Overcoming Low-Capital Challenges: I started with a monthly budget of $250 and scaled it to a 7 figure business. You cannot automate on a budget. You need to use face-to-face meetings