If 300 is your budget i would recommend going the trad route until youve built a round and have more spare income to expand. Though it might be very tight with that budget.
Ladders, roof rack, bucket, scrims, bucket on belt and then choice of tools. Pulex are perhaps the cheapest to begin with but they are also very good. 18inch channel with handle and an 18inch T bar with water wells and a good 18inch sleeve.
Then practice, practice and practice and go canvass.
For water fed, you need a tds meter to check your meter. Then you will know if you should go DI route or Reverse Osmosis route.
Then go gardiners for your poles n brushes n pole hose. Pure freedom has best price on a microbore main hose and then you need a reel, battery, pump and control panel.
Or
Diy trolley, but even DIY will be under 200 just for trolley alone.
So going by your current finances or budget you said, then i think you know which route is only available at the moment.
However if your able to wait until funds allow, then wfp would be the best route.
All the best in the new venture