Workouts to swim 100 yard free

Hello USMS I'm a new poster here, but have been lurking for some time. I come from a background of Olympic distance triathlons and shorter, but have been swimming for a solid 20 years. Unfortunately none of it was fast paced in nature, but more focused on sitting in a pack drafting with a wetsuit. My swim times for Olympic distance were in the 24 minute range so not horrible, but certainly not at the tip of the spear. I'm done with all that as my body can't take the abuse of running so want to give swimming full time a shot. I have no desire to swim distance really and would like to see what I can do in the next few years with the 100 free. Does anyone have any resources or ideas on what kinds of workouts I should be doing? I will have a solid 5 days a week to dedicate to swimming, perhaps even 6 on the right week. I am comfortable at with 3k workouts right now at 4 days a week. I will be lucky to swim with my local Masters squad 1 time per week as my hours don't allow me to meet at their time sans Saturday so most training will be on my own. Thank you for any advice in my training endeavors. Here are some splits from my pathetic sprint efforts in the pool tonight. An all out 100 off the wall was 1:11. However I did 6 x 50 and managed a 29-30 on the 2nd one, but the rest were 31-32. so apparently I have no ability to hold my all out pace very well. Did a hand full of 25's and had some in the 13 range, but mostly 14. Hard to tell exactly b/c I'm looking at an analog clock. Thank you USMS