As the others have stated, the resources that you will generate on your own will never equal what you have with a real fleet. Some fleets base fleet rank on your project donations, but the TrekBBS is not that way. I think of it more as a co-operative group. Any amount of donation benefits everyone.
Personally, I wish that STO would enact LOTRO's policy of dropping guilds that fall below 10 members...
Having said that, there never seems to be a shortage of newbies at Earth Space Dock that would be willing to temporarily join your fleet for 50k to 100k. You could also buy an existing fleet. (Just make sure that you kick all alts of the seller out and never let them join again. You should also change the name.)