Keep it simple
The ACOM Member tree program is absolutely fine to learn on.
The Learning Center has decent videos to learn how to build a tree, how to document, etc.
800 profiles in 3 months is HUGE, particularly if you're new to genealogy. Experienced researchers don't work any where near that rate.
Building family history is a slow and thoughtful process, something the teevee commercials negate to apprise you of, they make it look so quick and easy. Clicking and copying data from the ACOM user submitted trees is a sure way to add yours to the 98% of existing junk trees, which is what you're copying from.
A hint is a hint, not a fact or evidence, use them as leads ONLY to find documentation.
You have two choices,:
1) Stop adding and start weeding your existing tree. This can be very confusing process if you're just starting to understand the many functions of the tree program. Learning how to organize your data requires you learn the functions of the program.
2) I would advise you start a new tree. You can copy the profiles of those you have verified documentation for, from the old to the new tree. There are many threads on the Member Trees board on how to copy profiles and citations from one tree to another. All your trees should be private on ACOM, until you fully understand what you're displaying to the public.
Here's how to get get organized. Start with yourself, then your parents and your grandparents. You should have verified documentation for each individual in your tree, you can never have too much documentation.
Manually key-in the initial data for every person you put in your tree; this kind of data processing slows you down, and that's exactly how you get organized and learn. A pen and paper might really slow you down, but just practicing shaky leaf restraint will have the same effect.
When you reach 300-400 documented profiles, that's when you should consider purchasing a full blown genealogy program. That's a whole new learning curve.