I only dabble with Sketchup now and then. But now and then I spend hours reading up on recommendations for things like Premiere Pro, watch demonstration, benchmarking vids and the like. Adobe apps generally like more cores (vice versa something like AutoCad prefers a few fast cores). Today, that means a 1600/1600X processor minimum. 16GB 3000MHz DDR4 RAM minimum. And one SSD and a HDD. Consider back-up, if you don't have any then add a second HDD or external. Then PSU, motherboard (some features on the board may be nice for future upgrades, like dual or triple M.2 slots, with the fastest bandwidth, not always possible when working with a budget), and for that budget aim for a GPU like the GTX 1060 6GB, because some GPUs already have 11GB, so going into the future programs are likely to make use of a lot of video memory.
But before really going to town on all that, you could have a think about the monitor you'd like/need. Because you can make it the focus/priority of your build, once you have the minimum covered for the rest. Or if you aren't too fussed, then you can spend more of the budget on a faster processor, more RAM, and a second SSD (i.e. a scratch disk) for all the stuff like Adobe cache files, cache database, captured av, previews, media, project, cc library. It is better if you use the fastest SSD as the scratch disk. A regular SSD will be fine for OS/programs, and a regular one would be fine for all the rest too, but if you can afford a second faster one, then even better.
So as far as monitor, what do you need... 4K or less? Prefer Ultrawide or 16:10/16:9? Try and find a monitor that would work for you (preferably IPS unless you have a taste for VA, safe to say TN should be avoided for this purpose, refresh rate won't matter - 60Hz fine), and then see if the rest of the budget can make for a good system. Your input here is vital, as some might prefer a 1080p IPS monitor and the fastest system possible. Whereas others will want a better screen.
What storage size do you require for your work? This will have an impact on which SSD/s and HDD/s. SSD size is not something you want to overdo, as it can really cut into the budget, so if 500GB total SSD space (whether single SSD or 2 x 250GB) is enough, great. Then a 1/2/3/whatever TB HDD. Remember you can add more drives as time goes by, as long as the motherboard and the case can handle them, so you could perhaps think well I'll be fine with this storage amount for at least a year, so any extra in the budget can go towards other things right now.
TL; DR = please give us some input on the monitor and storage requirements.
