It depends on how much the time machine can send through, the amount of time required to spend on a single breakthrough and how many breakthroughs you need.
First through the time machine would be the most important piece of the entire process: The Plan. It details the minimum requirements to achieve success, and what technology needs to be researched and build to succeed. Along with this plan comes the simple knowledge of superior processes, construction and the pieces of research that have already been accomplished to complete The Plan. It's likely that this plan is simply placed on a supercomputer that can be taken apart, allowing the next generation to simply put it together and have the computer continue where it left off.
Next up are prototypes and equipment the people are going to need. If you can send back a machine capable of generating the required infrastructure without the people needing the knowledge to build the machine and infrastructure you can have them bypass these steps. The purpose is to accelerate research steps, for example by convincing disbelievers early on so they will help the process sooner and increase productivity for that Timeline.
Some timelines will be working on a single breakthrough in service of The Plan. They will research and develop a specific item or feature for 10 years in the hopes of completing it. If not complete they send their findings back in time so the next Timeline can finish the breakthrough, allowing them to complete research that takes decades. Other Timelines might make multiple breakthroughs.
Eventually The Plan will have all technology required to succeed, and thoughts need to go to creating all necessary components in a single Timeline. This probably requires multiple timelines to execute. One Timeline spends all its time building time machines that it sends back in time (in pieces if they have to). Not enough time machines? Next Timeline builds even more and sends the machines it received along with the newly produced back in time etc. You can even disassemble time machines near the end and send them back as well, "recycling" them and allowing future timelines to spend less time building time machines.
Then with enough time machines you can start sending components and materials back in time. Smart use of AI and cooperating components is key here, reducing the amount of time the Timeline needs to assemble the pieces send over as the pieces assemble itself and start production with the pieces of material send over. The best method would likely be placing the time machines in space, so that the required space to build stuff and energy are plentifully available.
This cycle continues, allowing each successive Timeline to send more components and material stockpiles back in time until they have the required amount. With this system you could eventually have such an array of time machines, components and materials that you can send over an entire Dyson swarm worth of materials and working machinery. From that point on I doubt there is any research or technology that wouldn't be in your grasp.
Edit: I assumed that materials could be sent over since you can send information. Information has to be stored in some physical property of an object or atom. So you have to send some physical representation of the knowledge back.