I'm 45 and have over 30 years of training but have only ran two cycles, both four weekers, before. I respond quite well to ph/ds so I thought Halovar pulsed for six weeks and the three others pulsed for two weeks each, just to see how I respond. I would use then eod as I workout eod. On my off days I use Diesel Test Pro. Pulsing appealed to me because of the fact that it provides all the benefits and reduces chance of sides....at least according to the pulsing thread by Dr. D. I'll run six weeks straight if that's what's best but I was just curious what would happen if I ran these other ph's as I described. I guess I like being a guinea pig.
There's a lot of info in the pulsing thread, I'd take my time and read through some more of it. First, the results are not as good as a full cycle; I think he mentions 60% of results with 40% of long-term sides, and hopefully no shutdown (still possible). Second, it's mainly an epistane recommendation because of the half-life and ability to dose high and get results on workout days. Superdrol is a good option too, but higher risk of shutdown. Halo isn't good for pulsing, generally speaking.
Another "pulsing" option is 2 weeks on, 2 weeks off to reduce the amount of HPTA shutdown, but it still requires PCT with a SERM for 2 weeks. The way it's recommended is to do 2 on, 2 off PCT, 2 on, 2 off PCT, etc. for 6 weeks. I don't know that much about it, but Tnation seems to have more info.
If you want full results, especially from Halo, run a straight cycle for 6 weeks 50/50/75/75/75/75, 4 weeks PCT. Take time on plus PCT for time off, meaning 10 weeks off before the next cycle.
No need to stack anything methylated on top of Halo. If you haven't used Halo before, no need to stack. If you want to cut, you can add something not methylated like CEL 11-sterone, p-stanz, or furuza-a.
Recommend you research, layout your cycle plus PCT, and post it for people to review and comment BEFORE YOU START! If you're 45, hard to tell on these sites, you don't seem to be acting like it. Not meaning to flame you here, but gotta be responsible with these compounds...