How Much to Spend to Start Flying FPV in Europe?

Hello. I am new here and am trying to get into FPV. I live in Europe specifically Czech republic and don't have any gear or some experience with FPV in general and would like to know how much should I expect to spend to start flying. But I like the idea of building my drone from scratch and also I think it's a bit cheaper than buying a pre-built drone.

I watched some videos and looked at some articles and from what I understood I should firstly get a controller and a simulator to get used to flying a bit. I thought about getting the Radiomaster Pocket with ELRS. But after I play for a couple of weeks or maybe months (depends how bad will I be at it) I will want to buy a drone, goggels, batteries and a charger to get flying IRL.

So I looked on how and what goggles to choose and people said to first choose the system they use (HD zero, Walksnail, DJI) and I don't really like the HD zero because of the image quality so for me the question is between Walksnail and DJI. I am not sure if I can buy the Walksnail Ascent in Czech republic but I know I can buy the Avatar L goggles and also the DJI N3 goggles. I would be probably choosing between those 2 or 3 because they are the cheapest but still seem pretty good.

I like the DJI the best so far because of the image quality and the penetration but it is a bit more expensive than Walksnail. Aslo people say that I will be locked into their eco-system but what exactly does that mean? If it just means that I won't be able to use a different camera or goggles I don't think that will be a problem for me because I don't see myself upgrading those two parts anytime soon after getting my drone. I would like to have the same goggles and possibly even camera for as long as possible. But if it's not future proof for at least 5 years (if that is even possible in this hobby) then I would probably go with the Walksnail because the image quality and penetration isn't much worse.

Also I would like to know what are my options for a combination of indoor and outdoor flying. I saw that a 3" cinewhoop could be good for that but I don't know if it's actually good or not. And also I would like to know how long does a battery usually last.

I know that this is a very long text and would not be suprised if nobody would go through the hastle of reading and actually responding to it but still I would appriciate any kind of advice.

Thank you in advance!