Hi Lenny, happy birthday. If you do a search of previous posts/topics you will find plenty versions of this question have been asked and answered already by far wiser and more serious stacker/collectors than me.
I have been at this with varying degrees of seriousness for about 3 years or so and if I could go back I'd tell myself to have a focus rather than just buying a bit of everything.
If I were you I'd get some empty tubes for the coins you plan to stack (place a wanted ad on the forum - they'll cost a couple of quid each) be it Brits, Eagles, Maples, Phil's, Maples or Krugs - I'd stick to one of these. If your budget is £30/month then I'd either pick up one a month from Atkinsons pre owned or save for say 6 months and buy 6-8 at a time - this forum will probably be your best bet for that. If you can afford more than £30/month then I'd do that too, but dont spend what you cant afford.
I say get tubes because it gives you a focus and it's nice to see your tube fill up, and when it is full you will have a fair old chunk of silver in your hand. Then start another. It's pretty addictive though...
Good luck and have fun.