Welcome to the wonderful, often confusing and frustrating world of reloading!
I normally tell new reloaders a few things to help them get started smoothly;
K.I.S.S. Reloading ain't rocket surgery, just go slow and read instructions.
Get a good basic reloading "how to" text and study it. The ABCs of Reloading is an excellent start.
Get a "generic" manual. Lyman 49th and 50th are very good with lots of load data and a good "front half". If you are shooting jacketed bullets get a manual published by the bullet manufacturer.
Can't go wrong starting simple, with a single stage press. Single stage presses with the need to change and adjust dies often, teach an essential, important aspect of reloading; die adjustment. Without knowing how to properly adjust your dies (not just the mechanics but understanding what adjustment and how much to adjust are essential for troubleshooting your handloads, which you
will have to do during your reloading "career"). After a few decades of reloading and using turret and Co-Ax presses, I still have many uses for a single stage press.
Also my Rule #1; pay very little (no) attention to any load data you see on any forum, any pet loads website, hear from any range rat, gun counter clerk, good intended friend, or gun shop guru. Get your data from published reloading manuals (but powder manufacturers have OK web sited with load data).
K.I.S.S.! Try not to overthink the process. Just go slow and follow instructions. Don't guess at anything.
If you are having trouble finding a powder measure, try powder scoops (Lee offers an excellent "Powder Measure Kit" consisting of 15 dippers and a powder chart). Along with this kit get a balance beam reloading scale. For a few years I successfully/easily used a dipper/scale combination for all my reloading. Treated right a balance beam scale will last a lifetime of reloading.
https://www.amazon.com/LEE-PRECISION-Powder-Measure-Yellow/dp/B081TDY9FR
https://www.titanreloading.com/Powder-Scales/lee-safety-powder-scale- nuttin' wrong with a Lee Safety Scale if you know how to read a Vernier scale.
https://www.amazon.com/RCBS-Mechanical-Scale-Green-Right/dp/B00T9YJOWI very good scale...
Go slow. Double check everything. Most important, have fun...