The act of getting the data in correctly is a precursor to but otherwise unrelated to the act of creating the chart or graph.
For ingesting this data, the easiest method - especially if you are just starting out - is to save it as csv then use the Add Data wizard in Splunk to ingest it as a structured CSV file. It walks you through all the steps, lets you check that timestamps are working and many other miscellaneous things. If you save it with column headers, you can tell Splunk at that time about them so it'll recognize all the fields properly. I heartily recommend creating a new index to put this data in so that you can delete it if you need to reimport. If you have problems with this process, you would get the best assistance if you could describe the process you followed and what happened as a result as well as you can.
Once you have that, confirm the data looks reasonable when searching for it in Splunk. You should be able to search something like index=mynewindex and get a list of fields down the left, data on the right and a green timeline of the volume at any specific time. Anything wrong here was likely caused in the preceding step, so the same procedure for getting specific help should be followed.
After it's properly showing up in Splunk, the answer to your question on making a chart may be fairly obvious after clicking around a bit, or perhaps it won't. If it is not obvious, then paste in an example of your events and what you are trying to accomplish so that we have some context for your question and we can probably help you with that.
